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Firebird Popular 90 - Thermostat doesn't seem to be working
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The wiring with the 3 pin plug should be from the left, the wiring coming out of the right hand side of the box should go to the burner. This hi limit stat is set to 110C (normal for most I think), its possible though that if yours is set to the same that the boiler temperature actually isn't reaching 110C, thus no trip, 110C equals to a pressure head of 4.2M so just abut borderline on whether the water should be hot at the cold feed coming from that F&E cistern, what you can do, as a temporary hi limit safety check is, (with power off) turn the temperature setting knob anticlockwise to its minimum setting slacken off the cover securing screws (3) remove the cover, slacken the hi limit stat locking screw and set the hi limit to say 90 for a start, DO NOT turn the centre adjustment slotted plastic screw as that is probebly the differential setting for resetting, (reset button must still be pressed if hi limit stat does operate), if it does operate then you can always reset to 105/110C knowing that, at least the hi limit stat is working, when refitting the cover turn the temp adjustment knob back to minimum first.
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Thank you Cuttlefish for starting this discussion. I hope that you have got your heating arrangements sorted - good idea to get this done before winter. I have read all the contributions with interest.
The physical layout here is similar. Was done maybe 18 years ago with oil boiler in garage with plumbing and wiring tracked underground to house. Rain water tends to pool over part of the sand/cement filled-in track and it does not look sound. I suspect that a live-earth current leak is not far off. Herself here would be unhappy if central heating was not available for even one day.
My work background is electrical engineering (now happily retired) and I'm planning an overhead replacement of the wiring to the boiler in the garage. The boiler has been replaced (12 months ago) with a Grant Vortex condensing oil boiler. It is working well and reliably for both radiator and hot water cylinder zones. It is a closed pressurised system.
I had the opportunity today to photograph the thermostat supplied with the Grant boiler and the internal connections that I made in it. All earths are wired together - I do not rely on the contact between the thermostat capillaries/phialls and boiler body to make good earth contact for burner earth. The data leaflet for the thermostats supplied with the boiler is confusing - it does not show earthing connections! Ask me for a scan of it if you want to see it.
Photo of boiler thermostat/safety cut-out box. It came with a decent functional wiring diagram on its side panel. But again with no earthing recommendations:
The internal wiring:
I will be doing the re-wiring between house and boiler at leisure. Will start a new topic about that in due course.
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