Vaillant fault code F.537
Fault code F.537 on a Vaillant heat pump (including aroTHERM Monoblock) means: Amount of refrigerant too high or too low, vacuum not sufficient (10 mbar), refrigerant contamination, pressure switch or electrical connection defective, premature expansion in the liquid range of the refrigerant circuit (charge loss), flow rate too high (see specified maximum flow rate), flow monitor defective, heat transfer in the heat exchanger not sufficient. Reset the appliance once. If the code comes back, a part is usually faulty.
After a safety alert (gas, flue gas, combustion), reset no more than once and call in a certified gas engineer. If you smell gas, call your national gas emergency number or 112 immediately.
Cause
Fault code F.537 on a Vaillant heat pump indicates: Amount of refrigerant too high or too low, vacuum not sufficient (10 mbar), refrigerant contamination, pressure switch or electrical connection defective, premature expansion in the liquid range of the refrigerant circuit (charge loss), flow rate too high (see specified maximum flow rate), flow monitor defective, heat transfer in the heat exchanger not sufficient.
Applies to
Vaillant aroTHERM Monoblock, VWL 115/2 A 400 V, VWL 155/2 A 400V, VWL 55/2 A 230V, VWL 55/3 A 230 V, VWL 85/2 A 230 V, VWL 85/3 A 230 V.
Matching parts
Vaillant parts are available from Instalpunt; shipping to EU countries from €17.95 (€24.95 for more distant countries), usually 3–5 working days.
Parts by Vaillant series: ecoTEC plus · ecoTEC pro.
This message does not point directly to one faulty part. These are the parts that most often fit this appliance:
- Vaillant gland for e.g. aroTHERM VWL 55/3 A 230V 0020175808 € 9.15
- Vaillant gland m25-17 € 14.37
- Vaillant filter for e.g. aroTHERM Pro VWL 75/7.1 A 230V 0020175862 € 15.03
Fix it yourself or call an engineer?
Always consult the manual for your appliance and work safely. If in doubt or if the fault comes back, call in a qualified professional. A question about a part? Write to us at info@instalpunt.nl.
Frequently asked questions
What does Vaillant heat pump fault code F.537 mean?
Amount of refrigerant too high or too low, vacuum not sufficient (10 mbar), refrigerant contamination, pressure switch or electrical connection defective, premature expansion in the liquid range of the refrigerant circuit (charge loss), flow rate too high (see specified maximum flow rate), flow monitor defective, heat transfer in the heat exchanger not sufficient.
How do I fix fault code F.537 on a Vaillant heat pump?
First check the cause described above. Then restart the appliance using the reset button. If the message comes back, a part usually needs replacing or the fault needs to be repaired by a qualified professional.
Which parts do I need for Vaillant fault code F.537?
That depends on the exact cause. In the Vaillant parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code F.537 myself?
You can reset the appliance and check things like the water pressure or settings yourself. Work on gas-carrying parts must be left to a certified gas engineer.
All Vaillant heat pump faults and codes at a glance →