BOILER IGNORING CONTROLS

[BettysBoiler]

Hi helpful people. Mother in laws boiler has developed mind of its own. Revealed the problem when bathroom rad became very hot despite all controls in off position.
Checked boiler and found that despite controls in 'off' boiler would ignite when boiler stat was turned up. Checked the frost stat (boiler is in small outside boiler room) by disconnecting it from control circuit but no change. Boiler will go back to pilot only lit if the electrics are turned off.
Checked wiring for a short and cant find any. Does this mean internal boiler control unit or stat has ceased to function.
Boiler is Stelrad Ideal WLx60. Serviced last year.
Thanks in anticipation. Need to get this resolved or mother in law will be moving into our place!

 

[picasso]

I cant find your boiler so at a guess I would check the 2 port valves, sounds like a stuck micro switch

 

[Boilerman2]

Ditto Picasso

 

[BettysBoiler]

Thanks for the reply....All I have to do now is find my micro switch and unstick it! Any clues as to its location. Update on boiler model (sorry I miissed a couple of letters) Stelrad Ideal WLx RS60. Thanks again for the help.

 

[doitall]

There was the WLX rs60 GCNo 41-415-57

or

3 WLX slimlines.

CF 60 41-415-85
CF60 41-415-86
60F 41-415-84

 

[BettysBoiler]

I'll take some more carefull numbers off the plate in the morning. Not going to disturd the mother in law just as Strictly is coming on. My life wont be worth living!

 

[Boilerman2]

THe Motorised Valves (microswitches inside) will probably be in the Airing Cupboard, the valves may just be stuck, or the Power heads may have failed its a job for a Heating Engineer really you could end up spending more money guestimating the problem yourself

 

[BettysBoiler]

The 3 way valves are in the boiler room. Quite happy replacing them if required. If I take the wiring to the valves (one at a time) out of the system and the boiler not longer fires up do you think I will be able to identify the faulty part that way?

 

[BettysBoiler]

The valves themselves aren't stuck moved them manually earlier and after turning the electrics off whilst working on various bits, when you turn back on and put the h/w and c/h to on the valves operate ok. Thats whats making be suspect the boiler controls themselves?

 

[doitall]

A pic of the valve would help, but as said, suspect the microswitch has stuck in the heating MV.

Makes and model would be a good plan as well.

 

[twgas]

As you say valves I wiil assume you have 2*2 ports (not 3 ports as you said), try isolating the power, disconnect one of the grey wires, reinstate electrics, if no better try the other grey wire, if that works reconnect the first grey and see what happens.

 

[BettysBoiler]

Yes sorry to be misleading. 2 motorised valves. I will do the wire removals in morning and check out the boiler codes properly and report back. Thanks to you all. Have a nice evening

 

[BettysBoiler]

Morning. just been over and checked the system. don't believe it....the fault has disappeared over night, must have been the fairies! All I can presume is that it is a small fault and all my prodding about has jarred something back to life. If it ain't broke I cant fix it! I will keep a watching brief over the next few days and see what happens. Thanks for all your ideas and help. If it reappears which I am sure it will., I will let you know what it was.