ATAG fault code B0
Fault code B0 on an ATAG boiler (including Perfect II) means: Flow water temperature rising too quickly. 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 B0 on an ATAG boiler indicates: Flow water temperature rising too quickly.
Fixing fault code B0: 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
ATAG Perfect II, PFSHR 24 / FGO … autom: MCBA1416, PFSHR 24 T(i)(Intelligence) / FGO … autom: MCBA5417, PFSHR 24/32 Ti Intelligence / FGO … autom: MCBA5417, PFSHR 35 / FGO … autom: MCBA1416, PFSHR 35 T(i) / FGO … autom: MCBA1416.
Fault code B0 on other ATAG series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- B0 on Perfect-series, PF-SHR 15, PF-SHR 24T NZ, PF-SHR 24T(i), PF-SHR 35T NZ: Flow water temperature rising too quickly No or insufficient flow in the system?.
Matching parts
ATAG parts are available from Instalpunt; shipping to EU countries from €12.95 (€16.95 for more distant countries), usually 3–5 working days.
Parts per Atag-series: A Series · i Series (iCon) · Q Series · E Series · P-series (iCon) · Blauwe Engel · XL-series.
This message does not point directly to one faulty part. If the code keeps coming back, view the ATAG parts:
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 ATAG boiler fault code B0 mean?
Flow water temperature rising too quickly.
How do I fix fault code B0 on an ATAG 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 ATAG fault code B0?
That depends on the exact cause. In the ATAG parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code B0 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 ATAG boiler faults and codes at a glance →