Hi. We have a gas boiler on an unvented central heating system.
Recently the CH stopped coming on when on the timer, unless the HW was set to come on at the same time. If the CH is set to come on it does not, but does once the HW timer comes on 2 hours later and then all is OK.
Once running all seems to work OK even when the hot water has gone off and the CH responds to the thermostat in the normal way.
We have a Honeywell motorised valve (2 port) on the CH and a Orkli 2 port on the HW.
I have replaced the head on the CH valve ( I already had one in the loft) as I thought it was perhaps not turning the micro switch on properly and also checked the movement on the valve base and this is fine. Unfortunately this has made no difference. I do not really want to purchase a replacement valve for the HW if this is not the problem.
Any ideas?
Recently the CH stopped coming on when on the timer, unless the HW was set to come on at the same time. If the CH is set to come on it does not, but does once the HW timer comes on 2 hours later and then all is OK.
Once running all seems to work OK even when the hot water has gone off and the CH responds to the thermostat in the normal way.
We have a Honeywell motorised valve (2 port) on the CH and a Orkli 2 port on the HW.
I have replaced the head on the CH valve ( I already had one in the loft) as I thought it was perhaps not turning the micro switch on properly and also checked the movement on the valve base and this is fine. Unfortunately this has made no difference. I do not really want to purchase a replacement valve for the HW if this is not the problem.
Any ideas?