AWB fault code 26
Fault code 26 on an AWB boiler (including ThermoElegance and ThermoMaster) means: Temperature difference between flow and return temperature too large in central heating mode. Reset the appliance once. If the code comes back, a part is usually faulty. You can check the water pressure and settings yourself; leave work on gas-carrying parts to a certified gas engineer.
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 26 on an AWB boiler indicates: Temperature difference between flow and return temperature too large in central heating mode.
Fixing fault code 26: step by step
- Reset the appliance once; a one-off measuring error will then clear.
- Where you can reach it without opening the sealed combustion section, check that the sensor plug is seated firmly and the wiring is undamaged.
- If the code comes back, the sensor or its wiring is usually faulty (short or open circuit). Sensors in the sealed combustion section should be replaced by a qualified heating engineer.
Applies to
AWB ThermoElegance, ThermoMaster, 6, HRG 30, VR 24, VR 24 T.
Fault code 26 on other AWB series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- 26 on ThermoMaster, HRG 22: Temperature difference between flow and return temperature too large in CH mode.
Matching parts
AWB parts are available from Instalpunt; shipping to EU countries from €12.95 (€16.95 for more distant countries), usually 3–5 working days.
This message does not point directly to one faulty part. These are the parts that most often fit this appliance:
- AWB ignition transformer € 33.98
- AWB flow/return NTC € 14.95
- AWB pressure sensor 10 mm € 92.42
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 AWB boiler fault code 26 mean?
Temperature difference between flow and return temperature too large in central heating mode.
How do I fix fault code 26 on an AWB boiler?
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 AWB fault code 26?
That depends on the exact cause. In the AWB parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code 26 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 AWB boiler faults and codes at a glance →