Boiler Fires when programmer off

dinsdale · 20 Dec 2004

I notice that this has been listed before but it does not appear to have a clear explanation I also have also had a phantom boiler running when the programmer is off(Tempus 7 approx 15 years old). It usually is in the middle of the night. Timed to go off at 22.00hrs and if the tank is drained just after can cause boiler to run at 01.00hrs. Only way to stop was switch off power and switch on when get up.

Was suggested that 3 way valve was cause as it somehow still had a live feed to it? Have replaced motorised valve but problem is now happening at random times during day. Do I now replace the controller?

kevplumb · 20 Dec 2004

sounds like an electrical fault

bathjobby · 20 Dec 2004

This suggestion is so obvious as to cause offence, but lets rule it out anyway; you have got the clock in the timer set to the correct time of day haven't you ?

dinsdale · 20 Dec 2004

Its always best to ask the obvious but its correct. Its an intermittant problem. The Tempus has a couple of neons indicating when on and they are not illumiated. Pump runs and boiler on but room stat not controlling (stat also has neons red and green and they are not on). I get woken up because I have a convector heater in bedroom.

dinsdale · 20 Dec 2004

Addendum

My only thought is that the electronic progmmer is allowing the pump, boiler and MV to receive mains power?

corgiman · 20 Dec 2004

what type of boiler is it and where is it sited

Thinking frost stat maybe???

Johndug · 20 Dec 2004

Have you got a frost stat fitted that you don't know about?
Sorry! I didn't see the previous post!

dinsdale · 21 Dec 2004

Thanks for comments

The boiler is a Baxi Bermuda which is in chimney breast downstairs. Its a pumped system and the water tank is directly above it in bedroom.

There is no frost stat.

The boiler running has also happened in the summer.

My thoughts are that its the electronic time controller which is somehow allowing power to the pump and boiler, impossible as sounds?

culross · 21 Dec 2004

The same problem happened to my combi boiler.
I leave the hot water on 24hrs and heating off at night .The diverter valve was inoperative and the rads were still heating up.
I fixed it by replace the synchron motor but you could replace the complete valve assembly.
This could also have been caused by a power supply problem to the motorised valve so it it worth checking this first.

dinsdale · 21 Dec 2004

Noted

I have replaced the complete valve actuator recently. Ill have a look at the wiring. What I cannot understand is that how can the pump, boiler and valve be powered when the time controller is off?

I'll take the hit and replace the controller.

Its alway difficult with intermittant faults

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Boiler Fires when programmer off

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