24 RI CH comes on when water on. Possible programmer fault also

[armyash]

Hi everyone

Been a while, hope everyone is well.

Been to a job tonight, if hw on rads get hot also. Ch 2 port seized open. Lever on valve permanently slack.

24 RI

Another issue seems to be programmer might be working intermittently. Even with ch and hw turned off at programmer, boiler fired up. What else could it be if not programmer?

Thanks

 

[mfgs]

The 2 port. Use your multimeter and chase the voltage to see where its coming from causing the boiler to fire. Sounds like a zone valve fault to me though.

 

[Destroyer2813]

If 2 port is seized open its making contact on the switch sending the signal to fire

 

[armyash]

Thanks the ch 2 port has definitely gone I know that much. Hot water coming through as soon as hw turned on.

Thanks for confirming for me. I was starting to over think things as usual and looking for another fault.

 

[armyash]

The 2 port that needs changing is a myson. 4 wires.

Is this an easy swap for a danfoss or any other.
Thanks

 

[Destroyer2813]

Yeah only difference would be a earth if you change to a metal head ie Honeywell

 

[SimonG]

Alright Ash, how's it going?

 

[armyash]

Only one I could get was a Drayton, is there any difference to the wiring? Thanks

 

[armyash]

It's 28mm, where does the white go?

Edit: from what I can see it goes in with the live? Is that correct?

Edit again: having another look it's in a terminal by itself as it becomes live when the valve close.

 

[ShaunCorbs]

sorry just seen its a 28mm

its like the grey wire

so just make it safe dont need it

 

[armyash]

All sorted thanks for the replies.

 

[Harvest Fields]

Glad that the lads could help. Sorry I was not around. Been away for a few days.