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Thank you. Il order new part and give it a go. Thanks for all the help, glad I stumbled across this forum :-) il put a bowl underneath for when I drop the screw (bound to happen ha)

Thanks for this. Much appreciated. Do I change it in situe or remove it from the pipe etc?

Honeywell valve. That's a picture of the sticker on the bottom on the valve. Let me know if need clearer pic if that doesn't help.

Iv never done that. Are they easy to change?

I can easily move the switch with one finger. Doesn't feel any resistance.

Update. I have now fitted channelplus h27xl series 2. To replace the original channelplus. Same wiring as original.but checked nothing loose. Everything fires even though turned off. I gently and repeatively hit the valve for the heating with my screwdriver and now the heating has gone off as...

This is the valve. There is no resistance on the switch at all. I can slide it freely when the power is on and off. The switch stays in the position I leave it. Is that normal or should it be dragging itself back?

I will check wiring to make sure nothing has come loose etc. Is their anyway I would be able to tell if it's the valve? The switch on the valve seems to move very easily, but iv never tried it before so don't know if it's always been like that

Just checked and yes as soon as I turn on the fused switch. Even tho the channel plus isn't there. Just the back plate. Everything fires.

I think it's like this. But without the frost bit. Sorry if I'm not clear, new to this.

Yeah that's what I tried :-( but the heating stayed on with that too :-(

That's correct 427 was original, 515 my handywork. Iv checked and checked and it seems iv wired it in correct order to me, but happy to be corrected. That is correct when channel plus refitted heating runs continuously, irrelevant of what I set the thermostat too downstairs. This does click...

I tried a Drayton lp822, but this didn't work. I have now ordered a horstmann h27 XL to keep the wiring the same as old unit?

Hi, I have rather stupidly attempted to change my heating control unit in the airing cupboard, due to previous unit repeatedly resetting itself for no reason. Now I have fitted the new unit, even with water and heating both off on the unit, the heating runs continuously. The thermostate...