combi boiler help/advise... please

[battyjules]

Recently I've had a new pcb ignition board fitted and a new sensor and everything seemed to be working fine again, but now I've noticed that occasionally ( say maybe once or twice every few hours) the boiler turns itself off completely (as if it's turned off) for upto a minute, then i hear the ignition clicking as it fires back up. This is a new symptom that has only recently started happening. Does anybody know what could be causing this?

[CJ2]

How many states is your boiler supposed to have and still work automatically?
1. gas lit and heating.
2. pilot light only
3. not even a pilot light ?
You seem to have a very efficient boiler that does not waste gas on keeping a pilot light alight (a boon when you go away for a summer break) as it appears not to need to. Lucky you. Is it not that you just didn't notice this before?

[CJ2]

If you are supposed to have a pilot on all the time, I'd get this seen to pretty damn quick. If a minute were to turn into much more, you could end up with a lot of unburnt gas waiitng for the next spark from your pcb igniter. I would hope that your pcb is having to operate a solenoid vale for the pilot light supply, but if not, I would expect, with my limited knowledge of these things, that it could be potentially very dangerious. Its not warm in most places at the moment, so I'm doubting if the pilot light really should go out in this current climate. If you can't turn the piloot light right off, I'd seriously consider turning the gas supply to the whole boiler off now until its been seen to or until you have more facts at your disposal as to how the boiler should be operating.

I'm no expert. I think I'd get one in if I were you. Ring Corgi if you're not happy with what your maintenance man has done or told you. Register your dissatisfaction in writing ASAP.

[raymondo]

You do not mention a pilot light, so why has everybody assumed there is one.
You said �I�ve had fitted� so call that tradesman back. However, it could be loose chocolate block connector of the PCB. If you have access to the PCB, turn the power off and check the small screws that hold the cables into the connector.
Alternatively it sounds to me like a problem with one of your motorised valves. The way the system works is that a thermostat senses the temp and if required passes a currents to the motorised valves that opens. The motorised valve then passes a current to the pump and the boiler sensing the pressure switches itself on. If the motorised valve then closes under spring pressure or such the power to the pump is switched off etc.
Unless you are certain that the problem is a motorised valve and that you can do plumbing, you will have to contact a plumber. The cost of a valve is approx �50 if bought off the net so add his hourly rate to the �50 and you will know what to expect, cost wise.
The alternative is the extractor fan within the boiler, if this cycles on and off then the boiler will do the same. A fan costs about �90 off the net.
Sorry it's so long

[raymondo]

Sorry forgot to mention.
If your problem was fixed, what was it?

[battyjules]

Hi,

Thankyou for your help. i do still have the problem and have recently discovered that when my boiler turns off which is happening more frequently now that i'm still able to get hot water, so it's my heating that is affected. I've spoken to the plumber, who is says it could be a diaphram? the plumber is going to pop and have a look when he's in the area. hopefully it will be soon.