Vaillant Ecotec Plus 610 fault F.028: My boiler's stopped working properly, no hot water or heating coming…
Published 22 June 2026 · Generated by BoilerTag's diagnostic AI from an engineer's real-world submission
One of 13 real-world fault checklists on BoilerTag, across 5 boiler makes.
Most likely cause
The Vaillant ecoTEC plus 610 displaying fault code F.028 indicates an ignition failure, meaning the boiler failed to ignite or detect a flame during startup. This leads to the boiler locking out as a safety measure. Common causes include issues with the gas supply, a blocked or frozen condensate pipe, a faulty ignition system (electrode, lead, transformer), or a defective gas valve or PCB. The clicking sound before lockout is consistent with the boiler attempting ignition. The normal pressure reading suggests the issue isn't related to low system pressure.
The engineer's report
A gas engineer submitted this case through BoilerTag's free fault diagnostic tool, working on a Vaillant Ecotec Plus 610 displaying fault code F.028. They described the behaviour they were seeing on site as follows:
“My boiler's stopped working properly, no hot water or heating coming through. It's making a bit of a clicking sound before it tries to fire up, then goes silent and shows 'F.028' on the display. The pressure gauge is looking normal, around 1.5 bar. It's been happening on and off for a couple of days now, but today it just won't come on at all.”
Before requesting the AI diagnostic, the engineer had already worked through the following checks:
“I've tried turning it off at the wall and then back on again, and I've pressed the reset button a few times. Each time it tries to restart, I get the same clicking noise and then that F.028 code pops up again.”
BoilerTag's diagnostic AI then cross-checked manufacturer documentation and common trade knowledge to produce the prioritised checklist below.
Working on this appliance? Full specs and fault codes for the Vaillant VU 10CS/1-5 (N-GB) ecoTEC plus 610 → · All Vaillant boilers →
Diagnostic checklist
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Commonly failed parts
- Ignition electrode and lead
- Gas valve
- Printed Circuit Board (PCB)
More Vaillant fault codes
Sources
The AI cross-checked the following manufacturer and trade sources while producing this checklist.
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