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- 7 Jan 2012
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Thanks to the excellent advice of this board I have bought a CM 907 Honeywell thermostat to replace the old Honeywell thermostat of uncertain provenance installed in my house. The system is currently set up with an old electromechanical timer by the boiler ( a combo unit). The timer has started to fail of late (slipping out of its settings) so I was intending to install the CM 907 to replace the functions of both by leaving the timer in manual on.
Unfortunately I have become rather confused trying to replace the old thermostat (see attached photo for the current wiring). I'd be very grateful for any assistance that can be offered As the wiring layout on the old thermostat has faded with time and I don't know how to proceed.
Many thanks in advance,
Tom
View media item 50657
Unfortunately I have become rather confused trying to replace the old thermostat (see attached photo for the current wiring). I'd be very grateful for any assistance that can be offered As the wiring layout on the old thermostat has faded with time and I don't know how to proceed.
Many thanks in advance,
Tom
View media item 50657