Recent content by macwales

Update Solution found!! I now have the CH working. First what was not causing the problem of CH not switching off when CH only required Boiler Programmer HW Thermostat Room Stat I had fitted new, all of the above without curing the fault and the boiler is 4 years old. Wiring Boiler...

That is correct. Heating stays on when not required. Even with room stat no demand and programmer no timed demand. Only switching off mains supply to programmer and everything else in control system resets 3 port valve to default W position. Without this reset this valve stays in H position and...

About the frost thermostat. I believe the Glow-Worm boiler has an internal frost stat. There is another external one in the boiler supply feed next to a three pole isolator switch. The isolator switch and external frost stat are both in the garage beside the boiler. The switch wire in the...

My sincere apologies, I must have deleted the word 'not' or I typed it wrong and at the the most important bit. I have edited post no 24 above so it is now correct. It should be Orange wire disconnected CH on at programmer, room stat on high, water at programmer off, 3 port valve at position...

Thank you for bearing with me it is much appreciated. I have disconnected and isolated the orange wire to the 3 port valve. Test results now CH on at programmer, room stat on high, water at programmer off, 3port valve at position H, boiler NOT firiing. CH & W on at programmer, room and...

We are getting crossover on our messages so I will wait to hear from you about the test results on the table you provided before doing the disconnected orange wire test. By the way, the new 3 port valve body has arrived and the spindle is nice and loose but then there is no water in it so no...

I have made a two switch test rig which I have left connected for now. I ran the test through several times. It was carried out with central heating only at programmer and room stat on high. Results differ from your table white off grey off valve is in W position 0v on orange wire white on...

Thank you for all your effort. I will carry out the test you suggest on the new actuator. It will take me some time. I originally thought the brass valve was stiff and have worked if by hand a few times. It moves but is not loose but I have nothing to compare it with so have ordered another...

Sorry for the confusion. I should have said 'the new 3 port valve and actuator was carefully wired to the same terminals in wiring centre as the old one' I was trying to make it clear that the new 3 port valve fitted is the present snap on actuator type while the old one had the actuator...

Correct.

As far as why controls were changed please see post 5 in thread above. The present fault has been present since new 3 port valve was fitted. Before this change, heating was switching on by itself in middle of night when programmer off and moving plastic parts of old actuator were completely...

Hi Answer to question from Stem 'What voltage is on the white wire, when the heating is still running when it shouldn't be? ' White wire zero volts. Note The system was misbehaving tonight so I did the test. Seems to work OK while CH is on with hot water as long as cylinder stat is...

Thanks for the reply I will test this tomorrow morning. I will need to set CH only to come on with the programme timer for a few minutes, then wait for the programmer to switch to no demand for CH. The fault will make the CH stay on and I will test the voltage on the white wire.

Results of voltage tests White wire 3 port valve at H with no programmer demand 0 (zero) volts Orange wire 3 port valve at H with CH programmer demand 115v Orange wire 3 port valve stuck on H with no programmer demand 115v Orange wire with 3 port valve at mid position with demand from...

Thanks for the replies. I will check the voltage on white and orange wires. 3 port valve was changed because the plastic body andvinternal parts of the permanently fixed actuator had disitegrated as it was 20 years old. New two part and actuator were wired to ssme terminals in wiring centre