ATAG fault code C1 05
Fault code C1 05 on an ATAG boiler (including A-series and E-series) means: Air purge programme active. 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 C1 05 on an ATAG boiler indicates: Air purge programme active.
Applies to
ATAG A-series, E-series, A203EC, A244C, A285C, A285EC, E223C, E22C, E264C, E264EC ALEC, A203C, A244CL, A244EC, Enigma, A203C / FGO … autom: LMUB, A244CL / FGO, A244EC / FGO … autom: LMUB, E223C / FGO … autom: LMUB, E264C / FGO … autom: LMUB, E320S / FGO … autom: LMUB, E325C / FGO … autom: LMUB.
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 sealing cap exhaust pipe Ø13mm for flue gas measurement € 20.91
- Atag sealing ring intake fan SHR for OSS1/2/3/4 € 20.91
- Atag O-ring set 4.8 x 1.8 mm heat exchanger connection € 20.91
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 C1 05 mean?
Air purge programme active.
How do I fix fault code C1 05 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 C1 05?
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 C1 05 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 →