BAXI 105e wont stop heating radiators!

[james4204]

hopefully someone can help me!

i have a baxi 105e combi boiler.

the hot water works fine, but the central heating constantly heats the rads!

the thermostat "clicks" when it reaches the right temp, but the hot water keeps on pumping around the rads!

the thermostat battery went dead yesterday, and i replaced it and seemed to work fine, but when i got home from workm it was about 26 degrees in the flat, and still heating!

if i turn the power button to the hot water only position it stops heating the rads, and the hot water works perfectly for the taps.

as soon as i turn back to ch/hw the rads het up again!

any sugestions???

 

[namsag]

Microswitch or pin sticking on flow switch on top of the divertor valve

 

[baxpoti]

Isolate boiler electrically.

On the boiler, incoming mains terminal block,
remove one of the wires on terminals 1 or 2,
does the heating switch off?

 

[james4204]

well, i was going to try all of the above...

but then tody it stopped being on constantly, and now it heats up, when it reaches the right temp, the boiler keeps "clicking" like its about to heat up, the green rad light comes on, the pump starts , then the green light goes out, and it all stops. then a few seconds later does it all again!!

an ideas about this now???

 

[james4204]

ok, now its stuck on constantly again :s

 

[Agile]

Houston, James has a fault!

 

[clf-gas]

Houston, James has a fault!

Somebody has been giving Tony humour lessons, c'mon own up. Who was it.

 

[james4204]

Houston, James has a fault!

Somebody has been giving Tony humour lessons, c'mon own up. Who was it.

lol, bloody combi boilers, nothing but headaches

 

[gas4you]

Isolate boiler electrically.

On the boiler, incoming mains terminal block,
remove one of the wires on terminals 1 or 2,
does the heating switch off?

 

[Agile]

I love boilers!

They are like women totally unpredictable!

One which has an intermittent fault which never fails where I am there is most typical.

I telephoned after two weeks yesterday to go round and replace the APS, even though it tests OK, but they told me that since I last went it had not failed even once in those two weeks. We agreed that I would not go back for the time being.

Today she emailed to say that after our conversation at 1800 yesterday it locked out THREE times during that evening. It must have heard her talking!

Tony

 

[james4204]

Isolate boiler electrically.

On the boiler, incoming mains terminal block,
remove one of the wires on terminals 1 or 2,
does the heating switch off?

right, i assume that the terminals 1 & 2 are the loop from the room thermostat??? removed these, and still the same problem. ( also replaced the thermostat as i hated the one i bought last year, and still same problems )

looking inside i notice the pin goes up, and turns the microswitch on as soon as i turn the mains on. when i turn the power off, the pin goes back in, and the microswitch turns off!!

what now ? lol

 

[james4204]

also, this happens regardless of what the timer on the boiler says, so even if it is ment to be off, it still heats the water!!

 

[baxpoti]

What happens when you turn the hot tap on?

 

[james4204]

What happens when you turn the hot tap on?

the microswitch on the CH is still pushed in by the pin , and hot water comes out of the tap!!

 

[granty1]

dont quite understand in wot is going on but it sounds as if the microswitch could be faulty and there fore creating a demand, therefore rads getting hot. disconnctct lead on microswitch.