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Vaillant EcoMax 236 non-ignition F21
Confidently diagnosed as defective IGNITION SEQUENCE PCB. When installed we will know the answers. I hate this contraption.- marchesexile
- Post #4
- Forum: Plumbing and Central Heating
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Vaillant EcoMax 236 non-ignition F21
Chris, Thanks for responding! That's right - no spark therefore no ignition. Fault code F21 refers to general "non-ignition", but isn't too clear as to what might cause it. The manual advises to check gas and water pressures. I first experienced the F21 problem soon after I moved in here -...- marchesexile
- Post #3
- Forum: Plumbing and Central Heating
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Vaillant EcoMax 236 non-ignition F21
Can anyone help with this one ? Vaillant EcoMax 236 model, 8 yrs old, at that time new installation in new house. Troublesome beast from beginning but that history. Serviced by authorised Vaillant engineer late summer 2004. Since early December has non-ignition fault - no fire up with F21...- marchesexile
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- Replies: 4
- Forum: Plumbing and Central Heating