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Boiler showing F.28 Fault. Steps taken to repair fault.......
1. Isolate electrical supply,
2. Clean Ignition Probes and Re-try
3. Not probe issue, Further investigation with Manometer test and Mustimeter testing
4. Identified Gas valve sticking
5. Replace Gas valve
6. Re-test and commissioned operational
Note: All works carried out were completed by a competent registered Gas Engineer.