brummydave
Senior Member
Called today to a mixture of faults, main concern being 'no hot water!'
Firstly, the immersion was blowing the rewirable fuse. Discovered the thermostat had been left at 80degC and they've been using it a lot lately rather than the gas boiler. Methinks something has overheated and given up? I did trace the probable culprit to a line-earth short. The neutral to line resistance was varying, but around 120 Ohms. I think this points to a faulty immersion heater rather than thermostat?
FYI It's a top fitted one but as it doesn't look like it's been pulled for a while my advice was get a plumber to change it incase all goes wetpear-shaped!
Second, the y-plan system was being a bit weird - The mid position valve has me confused. When water was set on, and the cylinder stat turned up, the boiler fired, pipes got hot. result. when cyl stat turned down, boiler went off. When heating only set on, boiler fired, pipes get hot. When both on, still ok. However, later discovered when water only on, the radiators were getting hot! Not nice in this weather . The little manual lever seemed to only be moved from centre to the 'manual' end and never all the way to the 'auto' end.
What fault does this point to please? Valve, motor or actuator?
FYI the cylinder stat was originally set at 50deg, there's no room stat and a 'classic' honeywell programmer which annoyingly loses programs every time power is off.
Thanks for your time,
Dave.
Firstly, the immersion was blowing the rewirable fuse. Discovered the thermostat had been left at 80degC and they've been using it a lot lately rather than the gas boiler. Methinks something has overheated and given up? I did trace the probable culprit to a line-earth short. The neutral to line resistance was varying, but around 120 Ohms. I think this points to a faulty immersion heater rather than thermostat?
FYI It's a top fitted one but as it doesn't look like it's been pulled for a while my advice was get a plumber to change it incase all goes wetpear-shaped!
Second, the y-plan system was being a bit weird - The mid position valve has me confused. When water was set on, and the cylinder stat turned up, the boiler fired, pipes got hot. result. when cyl stat turned down, boiler went off. When heating only set on, boiler fired, pipes get hot. When both on, still ok. However, later discovered when water only on, the radiators were getting hot! Not nice in this weather . The little manual lever seemed to only be moved from centre to the 'manual' end and never all the way to the 'auto' end.
What fault does this point to please? Valve, motor or actuator?
FYI the cylinder stat was originally set at 50deg, there's no room stat and a 'classic' honeywell programmer which annoyingly loses programs every time power is off.
Thanks for your time,
Dave.
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