With the program controller off and the room thermostat at 0 and the froststat at 3 th eheating comes on in warm weather?
Heating comes on uncommanded
- Thread starter BigglesTAP
- Start date
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Sorry last post not replies so didn't type it all out again in this one, here we go.
Boiler Worcester 24ri (2 years old)
Garage Frost Stat (18 years old)
Drayton Room Stat (18 years old)
Single zone with 3 port valve H M W. (2 years old)
Drayton LP522 programmer (18 years old)
Most of the time it works OK.
The room stat will be set at 0 and I hear it click on if I turn it up, the frost stat the same.
If I check the 3 port it will be on H and programmer heating is on, when I turn up the tank T stat the 3 port moves to W and back, if I switch programmer heating off 3 port stays in H, which I'm told it stays in last position. The pump is running.
If I switch off mains and back on seems to all self correct.
Boiler Worcester 24ri (2 years old)
Garage Frost Stat (18 years old)
Drayton Room Stat (18 years old)
Single zone with 3 port valve H M W. (2 years old)
Drayton LP522 programmer (18 years old)
Most of the time it works OK.
The room stat will be set at 0 and I hear it click on if I turn it up, the frost stat the same.
If I check the 3 port it will be on H and programmer heating is on, when I turn up the tank T stat the 3 port moves to W and back, if I switch programmer heating off 3 port stays in H, which I'm told it stays in last position. The pump is running.
If I switch off mains and back on seems to all self correct.
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You have been told correctly: the 3-port valve does stay in its last position. When held in the CH only position there is still a voltage on the orange wire. (This is the switched live to the boiler for CH only.) When only CH is running the voltage is 230VAC; but when CH is stopped and the valve held in CH only the voltage reduces to approx 150VAC. Normally this is low enough to prevent the boiler lighting. However some boilers will still light with this lower voltage. I believe some WB boilers are known to have this problem.
Your RGI should be able to sort the problem out with advice from WB.
Your RGI should be able to sort the problem out with advice from WB.
Many thanks, I have an electrical back ground, just not heating, so I can check and see if what you say is correct.
Should the installer have known this?
Should the installer have known this?
Last edited:
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