Got a call this morning off a mate who has the above boiler. Symptoms, this morning boiler was out on overheat stat and pilot light was on but boiler wouldn't fire. When I got there pilot had also gone out on its own.
So, never having been to one of these and having no manual. Tried to light pilot but wouldn't hold so cleaned out injector etc and changed thermocouple. Pilot then held but boiler wouldn't light, checked gas pressure all ok at valve, checked demand and got voltage at both solenoids.
Had trouble due to high winds blowing pilot light out and about so couldn't check anything with cover off only with cover on.
Checked stats etc all seems ok and diverter valve moving from C/H to DHW...managed to hold pilot long enough to get boiler to light but a few minutes later boiler went off and pilot went off with it, then....pilot wouldn't hold again and when I released the grey control knob the gas just seemed to peeter out and disappear, no clicking of solenoid closing.
Told customer that I suspected faulty gas valve and rung a pal who has worked on these before and he agreed after the tests I'd done and everything else he said he would change gas valve.
After struggling to find an obsolete gas valve but eventually sourcing one, replaced the valve. Boiler held on pilot ran for five minutes and back to square one, knocked off and pilot off again, but this time I can hear solenoid clicking. Again pilot wouldn't hold so changed for a universal one I got from local merchants. Pilot still won't hold and boiler wont fire, Anyway am stuck for ideas, going back in morning all I can think of is changing the thermocouple back to an original one and changing the injector although the flame from the pilot looks great and is turning the TC red so is obviously catching the TC correctly. Any ideas before I waste more money would be appreciated...Thanks.
So, never having been to one of these and having no manual. Tried to light pilot but wouldn't hold so cleaned out injector etc and changed thermocouple. Pilot then held but boiler wouldn't light, checked gas pressure all ok at valve, checked demand and got voltage at both solenoids.
Had trouble due to high winds blowing pilot light out and about so couldn't check anything with cover off only with cover on.
Checked stats etc all seems ok and diverter valve moving from C/H to DHW...managed to hold pilot long enough to get boiler to light but a few minutes later boiler went off and pilot went off with it, then....pilot wouldn't hold again and when I released the grey control knob the gas just seemed to peeter out and disappear, no clicking of solenoid closing.
Told customer that I suspected faulty gas valve and rung a pal who has worked on these before and he agreed after the tests I'd done and everything else he said he would change gas valve.
After struggling to find an obsolete gas valve but eventually sourcing one, replaced the valve. Boiler held on pilot ran for five minutes and back to square one, knocked off and pilot off again, but this time I can hear solenoid clicking. Again pilot wouldn't hold so changed for a universal one I got from local merchants. Pilot still won't hold and boiler wont fire, Anyway am stuck for ideas, going back in morning all I can think of is changing the thermocouple back to an original one and changing the injector although the flame from the pilot looks great and is turning the TC red so is obviously catching the TC correctly. Any ideas before I waste more money would be appreciated...Thanks.
