faulty motorized valve

[chipster]

hello all,
i have a slight problem with my boiler. looking at previous posts it sounds like a faulty motorised valve. (hot water....CH not comming on) my problem is........what does it look like? do i have one? i have a potterton combi 80 and have replaced the room thermostat after which it worked for a while and then stopped again?

any help would be great......thanks

 

[oilman]

Type "motorised valve" into a search engine like google or look at the honeywell site. Then when you've seen a picture you can look round your system.

 

[chipster]

thanks for the prompt reply

ive looked but i cant see it or anything like it. could it be a different system?
oh, if i manualy operate the switch (with a insulated screwdriver) inside the room stat, then the heating comes on. could it be something else?

all the best

 

[MANDATE]

sounds as though the room stat is faulty if you can over ride it and the CH functions.
You should be able to hear it clicking 'on' and 'off'.
You can always remove it ( after removing all power & making note of connections) and check with continuity meter as you turn it up.
If you do a search on room thermostats you may find information of interest

 

[chipster]

i thought that it might be faulty (thermostat) and i have replaced it twice now. new one works fine......next morning no response again. i thought that i might have bought a faulty unit but the same happened to the second stat as well, no `click` either.
maybe a faulty switch/relay ect on the board? dont know......!!

thanks again

 

[oilman]

OK then, lets have some info, what type of boiler do you have, ie make and model? Is it a sealed system? etc

 

[chipster]

sorted.

bought a decent digital thermostat and all seems to be well.
thanks for the advice anyway.

all the best