Buderus fault code H12
Fault code H12 on a Buderus boiler (including GB162) means: The cylinder temperature sensor is faulty. The function is taken over by the boiler software. Reset the appliance once. If the code comes back, a part is usually faulty, often the burner control unit or PCB. 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 H12 on a Buderus boiler indicates: The cylinder temperature sensor is faulty. The function is taken over by the boiler software.
Applies to
Buderus GB162, -.
Matching parts
Buderus parts are available from Instalpunt; shipping to EU countries from €17.95 (€24.95 for more distant countries), usually 3–5 working days.
Based on the cause, these original Buderus parts fit (always check the type number of your appliance):
- Buderus/Bosch burner control unit MPA 5002 € 518.95
- Buderus/Bosch burner control unit DKG972 G124/234/334 € 192.95
- Buderus/Bosch burner control unit GB302-80kW up to 2002 € 855.95
Further reading on this cause
Other Buderus codes with the same cause
- H11 — The outlet or cold water temperature sensor is faulty. The function is taken over by the…
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 Buderus boiler fault code H12 mean?
The cylinder temperature sensor is faulty. The function is taken over by the boiler software.
How do I fix fault code H12 on a Buderus 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 Buderus fault code H12?
That depends on the exact cause. In the Buderus parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code H12 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 Buderus boiler faults and codes at a glance →