ATAG fault code 154
Fault code 154 on an ATAG boiler (including I-series) means: Flow temperature rising too quickly, dT too large, return > flow. 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 154 on an ATAG boiler indicates: Flow temperature rising too quickly, dT too large, return > flow.
Applies to
ATAG I-series, i20EC CW3, i28C CW4, i28EC CW4 with economiser, i32S, i36C CW5, i36EC CW5 with economiser.
Click a model for the parts list and exploded view of that appliance.
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. These are the parts that most often fit this appliance:
- Atag seal gas valve 3/4" € 18.95
- Atag sealing ring pump 1" 2 pcs € 19.60
- Atag O-ring set 2 pcs 21.89 x 2.62 mm plate heat exchanger € 22.87
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 154 mean?
Flow temperature rising too quickly, dT too large, return > flow.
How do I fix fault code 154 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 154?
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 154 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 →