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Frozen Air Conditioner or Air-to-Air Heat Pump in Enschede


Professional fault diagnosis, maintenance and repair of air-to-air heat pumps, split air conditioning systems and refrigeration equipment.

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Project Description

A customer reported that the heating performance of an air-to-air heat pump had gradually declined during the winter season. The outdoor unit became increasingly covered with ice, while the automatic defrost cycles were no longer sufficient to maintain efficient operation. In addition, ice formation and contaminated indoor filters were identified.

Following an initial visual inspection, a comprehensive technical assessment of the complete system was carried out to identify the actual cause of the icing instead of merely removing the visible symptoms.

Initial Situation

  • Outdoor unit showing light to heavy ice formation
  • Heavy icing of the evaporator coil
  • Iced and contaminated indoor air filters
  • Reduced heating and cooling performance
  • Increased energy consumption
  • Extended defrost cycles
  • Controller fault indications

Initial Ice Formation

Even minor ice formation can significantly reduce heat transfer. Modern heat pumps therefore initiate automatic defrost cycles to maintain efficient operation.

Light contamination of heat exchangers or air filters can already reduce thermal efficiency considerably. This results in longer operating times, higher electrical consumption and increasing annual operating costs. Routine maintenance is therefore essential for maintaining both energy efficiency and system reliability.

Our Technical Diagnosis – Inspection of Heat Exchangers and Airflow

Before refrigerant circuit measurements are carried out, all heat transfer components and airflow paths are inspected. Dirty heat exchangers, blocked filters or restricted airflow frequently cause significant performance losses and may accelerate ice formation.

Dirty or frozen air filters reduce airflow considerably and may contribute to excessive icing of both the indoor and outdoor units.

Visual Inspection

  • Evaporator coil
  • Heat exchanger fins
  • Airflow
  • Fan operation
  • Condensate drainage
  • Contamination
  • Air filters

Refrigerant Circuit Inspection

All operating parameters were verified using calibrated measuring equipment.

  • High-side pressure
  • Low-side pressure
  • Evaporating temperature
  • Condensing temperature
  • Superheat
  • Subcooling
  • Refrigerant charge

Electronic System Inspection

  • Temperature sensors
  • Evaporator sensor
  • Outdoor temperature sensor
  • Main control board
  • Fan controller
  • Fault codes and system communication

Results

  • ✓ Full heating capacity restored
  • ✓ Automatic defrost operation restored
  • ✓ Reduced energy consumption
  • ✓ No further ice formation
  • ✓ Stable and reliable operation

🔧 Air Conditioner or Heat Pump Frozen?


Our service engineers support residential, commercial and industrial customers with maintenance, fault diagnosis and repair of split air conditioning systems, air-to-air heat pumps and refrigeration equipment.

Whether you operate a residential heat pump, a commercial air conditioning system or industrial refrigeration equipment, we provide professional technical support, structured diagnostics and sustainable maintenance solutions.

Coolenvi™ is there for you ツ゚
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Possible Causes of Ice Formation


Ice formation is not always caused by a single component failure. In many cases several factors contribute simultaneously, making a systematic assessment of the complete HVAC system essential for accurate fault diagnosis.

  • Dirty air filters
  • Restricted airflow
  • Contaminated evaporator coil
  • Faulty fan motor
  • Defective temperature sensors
  • Four-way reversing valve malfunction
  • Electronic expansion valve failure
  • Low refrigerant charge
  • Refrigerant leakage
  • Electronic control faults
  • Defective defrost operation
Tip
 BIMservice | Air Conditioner Technician
BIMservice | Air Conditioner Technician
Task - AC: E | Connection Condensate Lift Pump - Indoor Unit | Task - Work Location: DK - From Ribe
The air conditioning technician for air conditioning and refrigeration systems in buildings, committed to economical and environmentally friendly climates. System mechatronics engineers: Services with a focus on safety, environmental protection, and expertise As air conditioning and refrigeration system mechatronics engineers, we master a broad spectrum of skills spanning mechanical, electronic, and electrical trades. Our services range from precise leak tests to fine-tuning and factory settings of the refrigeration circuit. Our range of services includes: Accurate leak tests: We perform precise leak tests to ensure the proper functioning and longevity of your systems. Adjustment and factory filling of the refrigeration circuit: Our expertise extends to the fine-tuning and correct filling of the refrigeration circuit to ensure optimal performance. Personal protection and environmental protection measures: We attach great importance to protecting the safety of people and the environment. This includes measures to protect groundwater from oil loss in refrigeration systems and from leaks in closed systems containing climate-damaging gases. These protective measures extend throughout the entire installation and operation process to ensure safe operation. Why Choose Us? We are internationally recognized for our contributions to environmental protection and safety in building operations. Expertise and access to AI technologies: Our many years of experience and advanced knowledge in the field of artificial intelligence enable us to offer innovative solutions and stay at the cutting edge of technology. Choose us as your plant mechatronics partner to receive first-class services that combine safety, environmental protection, and expertise. Always fully configure supply chains This ideally only applies to a 4-day week from Monday to Thursday. This is not an all-inclusive package. Travel costs and work materials are not included and can be found at BIMdepot™, BIMcare™, BIMpilot™, or BIMphase™. BIMcare™ customers automatically receive a discount on this item.

DKK 1,083.15*
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BIMcare | 48plus Warranty Extension
BIMcare | 48plus Warranty Extension
Item - Quantity: 1 Pc
With the 48plus package, you extend the standard warranty of your Coolenvi-purchased unit from 6 to 48 months – including complete documentation of the optional BIMcare™ maintenance services. If it is determined on site that the unit was not purchased from Coolenvi, the appointment can, upon request, be carried out as a one-time BIMcare™ maintenance service under the applicable BIMcare™ terms. In this case, any further maintenance services under 48plus are not part of the agreement. Any inspection, assessment and travel services already performed will be charged accordingly. Your benefit: maximum operational reliability, predictable costs and worry-free operation of your air conditioning system for years to come. What are the benefits of 48plus? Extended protection: Warranty extended from 6 to 48 months from the installation invoice date. Preventive maintenance: Regular, documented BIMcare™ inspections reduce the risk of failures and maintain your system's efficiency. Fast follow-up service: Identified faults or worn components are repaired or replaced promptly, ensuring your warranty remains valid. Predictable costs: Preventive maintenance and the prompt correction of minor defects help avoid expensive repairs and keep your operating costs under control. Professional service: All repairs are carried out exclusively by qualified technicians in accordance with the manufacturer's specifications. What does 48plus cover? Coverage requires that the unit was purchased from Coolenvi and that all BIMcare™ maintenance services are fully and continuously documented. The 48plus package covers technical defects and malfunctions affecting your indoor unit during normal operation. Damage caused by improper use or external influences is excluded. What is not covered by 48plus? The following types of damage are excluded if they occur outside normal system operation or as a result of external influences. Examples include: Storm and weather damage, lightning strikes, power surges or fluctuations in the electrical supply Damage resulting from missing or incomplete maintenance or missing chemical protection documentation Repairs, modifications or other work carried out by third parties without authorization Physical damage caused by persons, vehicles or other external impacts System overload caused by permanently open doors or windows, incorrect climate settings or unusually high heating or cooling loads Units not covered by an active 48plus package in combination with a BIMcare™ maintenance package. Would you like to read the complete warranty terms and conditions? Learn more BIMcare™ – Maintenance Follow-up & Repair Process BIMcare™ views maintenance as an ongoing support process. Our technicians inspect your system for wear and potential causes of failure and provide clear recommendations for corrective action. Upon request, we professionally carry out the necessary repairs or replacements to ensure your warranty remains valid and your system continues to operate reliably. In short, 48plus combines extended warranty protection with active, documented maintenance management – ensuring maximum system availability and minimal operating costs. You will receive your myBranchtool™ access credentials after ordering a 48plus or any other BIMcare™ maintenance package. Open myBranchtool™

DKK 1,493.85*
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BIMservice | Disposal of Split Air Conditioning System
BIMservice | Disposal of Split Air Conditioning System
Having a BIMcare contract: ✅ Yes, with contract | Task - AC: FIT | Decommissioning operating Split Type System | Task - Work Location: DK - From Ribe
Dismantling of a freely accessible split air conditioning system (typically ground-floor installation without lifting equipment or special access), including indoor and outdoor units and full separation of system components. A project-based benefit may apply in case of a follow-up installation at the same site via our system partners or an active BIMcare maintenance agreement. Refrigerant and oil management in accordance with environmental regulations: Includes professional recovery and handling of up to 3 kg of refrigerant as well as safe removal and disposal of compressor and system oils in compliance with applicable environmental and safety standards. Disposal of system components: Professional dismantling waste is transferred into certified recycling and disposal streams in accordance with applicable regulations. Scope of service: The service includes dismantling and disposal only within a standard accessible installation environment. Transport is excluded and charged separately depending on service hub distance. Always fully configure supply chains This ideally only applies to a 4-day week from Monday to Thursday. This is not an all-inclusive package. Travel costs and work materials are not included and can be found at BIMdepot™, BIMcare™, BIMpilot™, or BIMphase™. BIMcare™ customers automatically receive a discount on this item.

DKK 5,961.06*
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BIMservice | Fault Diagnose Air Conditioning
BIMservice | Fault Diagnose Air Conditioning
Task - Work Location: DK - From Ribe
Unknown fault with air conditioning? We will find the cause within 3 hours for quick repairs. The advantage of a maintenance contract After maintenance has been carried out as part of BIMcare™, we will reimburse 50% of the costs of a fault diagnosis, provided that the resulting repair offers are commissioned and BIMcare™ is then continued for at least 12 months without interruption. Always configure supply chains completely This is ideally suited for a 4-day work week, Monday through Thursday. This is not an all-inclusive package; travel expenses and materials are not included and can be found at BIMdepot™, BIMcare™, BIMpilot™, or BIMphase™. BIMcare™ customers automatically receive a discount on this item.

Content: 3 Hour/s (DKK 1,083.15* / 1 Hour/s)

DKK 3,249.45*
Tip
BIMservice | Fault Diagnose Air Handling
BIMservice | Fault Diagnose Air Handling
Task - Work Location: DK - From Ribe
Unknown fault in a supply air ventilation system? Within 3 hours, we identify the root cause on site and provide the basis for a fast and targeted repair. The Benefits of a Service Agreement Following maintenance carried out under BIMcare™, we reimburse 50% of the cost of a fault diagnosis, provided that the resulting repair work is commissioned and BIMcare™ is then continued without interruption for at least 12 months. Always Configure the Entire Supply Chain The service is preferably scheduled within a four-day working week from Monday to Thursday. This is not an all-inclusive service. Travel expenses, tools and consumable materials are not included and can be ordered through BIMdepot™, BIMpilot™ or BIMservice™.

Content: 3 Hour/s (DKK 1,083.15* / 1 Hour/s)

DKK 3,249.45*
Tip
BIMservice | Fault Diagnose Construction Technology
BIMservice | Fault Diagnose Construction Technology
Task - Work Location: DK - From Ribe
An error in the construction technology? Within 3 hours we have solutions ready and estimate the repair costs. The construction technology error analysis We inspect, measure, endoscope, dismantle, walk around and find the best way to locate the causes and develop well-founded technical action plans. We are aware that not everything can be done within a few hours, but a structured and precise damage analysis lays the foundation for a sustainable solution. The advantage of our BIM facility management If you use our facility management continuously or as part of BIMcare™ maintenance, we will reimburse 50% of the costs of a fault diagnosis, provided that the resulting repair offers are commissioned or BIMcare™ and facility management are subsequently continued for at least 12 months without interruption. We do always recommend an appropriate BIM-Model of your building. Always configure supply chains completely It is best to work 4 days a week from Monday to Thursday. This is not an all-inclusive package, travel costs and work equipment are not included and these can be found under BIMpilot™ or BIMservice™.

Content: 3 Hour/s (DKK 1,083.15* / 1 Hour/s)

DKK 3,249.45*
Tip
BIMservice | Fault Diagnose Control Technology
BIMservice | Fault Diagnose Control Technology
Task - E&IC : IC | Analyze cause of fault | Task - Work Location: Remote
Unknown fault in the control cabinet? We will create a diagnosis within 3 hours to solve the problem. The advantage of a maintenance contract After maintenance has been carried out as part of "BIMcare", we will reimburse 50% of the costs of a fault diagnosis, provided that the resulting repair offers are commissioned and BIMcare is then continued for at least 12 months without interruption. Always configure supply chains completely It is best to work 4 days a week from Monday to Thursday. This is not an all-inclusive service, travel costs and work equipment are not included and these can be found under BIMpilot or BIMservice.

Content: 3 Hour/s (DKK 1,083.15* / 1 Hour/s)

DKK 3,249.45*

🛡️ Comprehensive Technical Assessment Instead of Individual Measures


Comprehensive System Diagnostics for Sustainable Solutions

Ice formation is rarely the actual fault. Instead, it is usually a visible symptom of an imbalance somewhere within the refrigeration or heat pump system. Our BIMservice™ methodology focuses on analysing the complete installation, including airflow, heat exchangers, refrigerant circuit, sensors, electronics and system controls.

Evaluating all operating parameters together allows unnecessary repairs, component replacement and secondary damage to be avoided. All inspections are performed in accordance with manufacturer specifications and recognised HVAC and refrigeration engineering standards.

Coolenvi™ supports residential, commercial and industrial customers in Enschede with comprehensive technical diagnostics instead of isolated component replacement.

Testing & Measurement

Verification of refrigerant pressures, temperatures, airflow rates and electrical operating parameters.

Refrigerant Circuit

Leak detection, refrigerant assessment and complete functional testing according to manufacturer specifications.

Documentation

Complete documentation of inspection procedures, measurements and corrective actions.

🚀 Select the Service That Fits Your System


Whether you require emergency assistance or a preventive maintenance agreement, our engineers will recommend the most suitable technical solution for your installation.


🔧 BIMservice™ – Fault Diagnosis & Repair

BIMservice™ has been developed for systems experiencing operational faults. Our objective is to identify the root cause through structured diagnostics, perform a technical assessment and restore reliable operation wherever possible during the initial service visit.

  • On-site fault diagnosis
  • Inspection of indoor and outdoor units
  • Electrical and sensor testing
  • Defrost system verification
  • Measurement of operating parameters
  • Repair recommendations
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Prepare Your System Before the Cold Season

Many heating problems only become visible when your air conditioner or air-to-air heat pump is needed most. A preventive inspection before winter helps identify hidden performance losses, airflow problems and technical issues before they lead to unexpected downtime.

Schedule your maintenance early and ensure that your system is ready for reliable heating operation when temperatures drop.


🛡️ BIMcare™ – Preventive Maintenance Agreement

BIMcare™ provides scheduled maintenance programmes that improve reliability, reduce energy consumption and extend the operational life of your HVAC installation.

  • Scheduled inspections
  • Cleaning of filters and heat exchangers
  • Airflow verification
  • Defrost function testing
  • Operating parameter verification
  • Documented maintenance history
Request Maintenance Agreement

Rather than replacing components unnecessarily, our objective is to provide a structured and evidence-based technical diagnosis. With BIMservice™ and BIMcare™, Coolenvi™ offers professional HVAC, air conditioning and refrigeration support in Enschede, Overijssel and the eastern Netherlands.

Your Local HVAC Partner in Enschede and Overijssel

Coolenvi™ supports residential, commercial and industrial customers with maintenance, fault diagnosis, repair and optimisation of air conditioning, heat pump and refrigeration systems. Routine maintenance reduces energy consumption, operating costs and unexpected system downtime while extending equipment life.

More Than Just Repairs

With BIMservice™, you receive structured fault diagnosis for existing system failures. With BIMcare™, you benefit from preventive maintenance programmes, documented inspections and long-term asset protection. Together they provide a reliable, energy-efficient and cost-effective solution for modern HVAC installations.