Central heating failed need help

[merlin1964]

Hi, Yesterday my CH failed, The central heating was on but because it was a nice day not hot, firstly i noticed the hot water was very hot mid afternoon and it should not be, later in the evening it was cold radiators. The first thing i jumped for was the pump as it had been noisy for some time so i replaced it but not end of problem.
My system is Glowworm ultimate, Siemens programmer, 3 port motorised valve, fully pumped, room stat (was) acl drayton 3 wires yellow red blue, I have since changed that for Honeywell T6360 but not sure of wiring. The pump runs on hot water but not CH. if I push the MV right over and hold it there whilst programmer is on HW the radiators get hot. The boiler fires ok. Can anyone assist me. regards Mick

 

[stardanny]

Recheck the wiring to room stat is correct.

When turn stat to on, do 3 port motorised valve open to heating? if not, valve failed.

What make of valve?

Dan.

 

[merlin1964]

Thank Dan for quick response. Its a Lifestyle Mid-Position Valve (679H340-3OLO.) if thats any use. Not sure how to wire up room stat, any ideas, regards Mick

 

[seco services]

what is the lever on the side pointing to when ch switched on and not hw
w m h

 

[merlin1964]

At the moment W, maybe because i have not wired in the room stat (don't know how) Before it went wrong never noticed. Mick

 

[seco services]

what connections have you got on the back of the thermostat ?

 

[stardanny]

And on the old one, which wire connect to which connecter? There a numbers on it.

Dan

 

[merlin1964]

On the old room stat Drayton RTS1 N L 3call red blue yellow worked ok. New stat Honeywell T6360B

 

[seco services]

your new stat should be
1 live
2 neutral
3 heat call

 

[merlin1964]

Done that, but now and before i did it, boiler fails to light on CH or HW

 

[seco services]

need to know the rest of the wiring

 

[merlin1964]

Where and which wiring

 

[seco services]

call for heat wire what colour does that goto in wiring box

 

[merlin1964]

call for heat yellow goes into siemens programmer no4 on wall plate

 

[seco services]

right start from here not sure on your colours.
but when programmer/timer comes on the live wire from programmer gos to n0 1
n0 2 neutral.
then 3 from thermostat go's to the white wire from the mot valve. to tell that to open