I have an older looking conventional Potterton gas boiler in the house I've just moved into (not sure of model but can find out if needed) with a hot water cylinder and two motorised Honeywell valves. Tank thermostat set to 70F and boiler thermostat on 3 (out of 5).
CH works fine. Radiators are hot within 15 mins.
HW - either nothing (no noises at all). Or, the boiler fires for less than a minute and then trips out. If the CH is on at the same time this keeps the boiler firing and the HW then works (but only luke-warm) but the house is like a sauna at this time of year!
The motorised valves are set on AUTO, but allow you to move the switch to MAN/ON when the boiler fires for the HW and you can hear them whirring - but moving them into the MAN/ON position (as sometime suggested on this forum) doesn't keep boiler firing.
The pipe at the top of the cylinder never gets more than luke-warm.
Any ideas???
CH works fine. Radiators are hot within 15 mins.
HW - either nothing (no noises at all). Or, the boiler fires for less than a minute and then trips out. If the CH is on at the same time this keeps the boiler firing and the HW then works (but only luke-warm) but the house is like a sauna at this time of year!
The motorised valves are set on AUTO, but allow you to move the switch to MAN/ON when the boiler fires for the HW and you can hear them whirring - but moving them into the MAN/ON position (as sometime suggested on this forum) doesn't keep boiler firing.
The pipe at the top of the cylinder never gets more than luke-warm.
Any ideas???