F5 fault
Happened first time ~18 months ago
Watched boiler & pump yesterday & it malfunctioned
No signs air in system
Overheat stat seems OK – in any case didn’t trip as I'd turn down the boiler temp for fault finding
Fault seems to be that Boiler control unit is randomly switching off pump
Don’t want to be ripped off by plumber – any opinions?
Known fault?
Replace boiler control board?
Any help much appreciated!
Happened first time ~18 months ago
- Plumber called in – overheat thermostat had triggered – push reset – OK ~12 months
- Started doing it increasingly frequent intervals – now almost every few days
- Replaced overheat stat, checked connections, still doing it
Watched boiler & pump yesterday & it malfunctioned
- Operating OK 67C/53C & pump running (max flow)
- Click from boiler – relay? – pump switched off but boiler still operating
- Temperature rose to 85C
- Few minutes later, click & pump came back on, boiler temp dropped back to normal & boiler fired up. Temperature range 67/53C
- Repeated this click – pump off/pump on at random intervals
- Switched off boiler to reset, no difference
- Overheat stat didn’t trip
No signs air in system
Overheat stat seems OK – in any case didn’t trip as I'd turn down the boiler temp for fault finding
Fault seems to be that Boiler control unit is randomly switching off pump
Don’t want to be ripped off by plumber – any opinions?
Known fault?
Replace boiler control board?
Any help much appreciated!