Please can somebody help me?
I have a back boiler / gas fire combination ( Thorn Housewarmer e ).
The problem that I have is that I cannot get the pilot light to stay
The instructions state - make sure the central heating is switched on,
hold the pilot light switch and press the ignition. Then hold the
pilot light switch until for approx 20 secs and then gradualy release.
This should keep the pilot light on. However I have tried this
numerous times but it just go's out!
I have replaced the thermocouple, but again to no success.
This problem has only just started occuring. I had the system working
yesterday but the back boiler kept going out intermittently and now it
wont come on at all. Any idea's.
I have a danfoss CH terminal. When the on switch was depressed the
whole back boiler came to life, but now it clicks but seems it doesnt
do anything else.
It sounds very like the thermocouple, which tells the main gas valve that
the pilot flame is lit, has gone faulty. Have a web search for spare parts
on your make and model of system, or for a supplier of a universal
OP says (s)he's already replaced the thermocouple!
For the whole thing to work, the pilot has to heat the thermocouple - which,
in turn, tells the gas valve that all is well and allows the boiler to fire.
If this is not happening, it could be caused by any of the following:
* Duff thermocouple (unlikely, since this has already been replaced)
* Incorrectly connected thermocouple
* Faulty pilot flame (crud in the jet, or pilot pressure regulator set too
* Thermocouple not aligned properly (so that it's not being heated properly
by the pilot flame)
* Duff gas valve
Working through that lot should hopefully find the cause, and fix it.
On Thu, 04 Dec 2003 15:30:32 +0000, Roger Mills wrote:
Agreed. Make sure the you have preperly eliminated the first four before
considering the gas valve.
On many models you can feel whether the is some 'stickiness' in the
release button. If you can feel some but it is not enough to hold the
flame on then I'd suspect the thermocouple, or not in the flame, or not
enough flame. If you feel nothing at all then a loose connection.
Note that the connection of the thermocouple to the gas valve is quite
awkward and easy to get a misconnection.
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
I have changed the thermocouple, made sure the boiler was clean and
checked the jets. However none of them seems to of helped. I have
managed to get the pilot to hold once but when I have then switched
the CH on it just clicked and the back boiler didnt come to life.
Before when the CH was switched on there would be a sort of whooshing
noise then the back boiler would ignite. I dont know what to do next.
I have also searched the net for spares for the make of back boiler
but to no avail, can any one help me here, please.
Thanks for your help so far gents.
Look forward to your response.
If you're sure the thermocouple is ok for your boiler and it working, then
it sounds as though the gas valve may be faulty.
I don't know these boilers but it proberly works like this...
The thermocouple, when up to temp, will latch on the gas valve to keep it
on, thats why you have to hold it in for some time.
Then the main part of the gas valve will open when there is demand voltage
The click sound may be the gas valve trying to work.
The whoosing noise is the initial ignition of the main burners.
It also possible that there may be some muck in the gas inlet at the boiler.
Often there is a small strainer in there.
If it is the gas valve there are only a few makes of those used by most
Changing one of these is not for the faint hearted though..
The people at http://www.cetltd.com may be able to help.
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