SOURCE: We have a newly installed
You have wired the cooling (yellow) and the heating (white) backwards.
SOURCE: Honeywell ST6400C - hot water not working
some digital thermostats do no not work with zone valves is this a new thermostat that you had installed
SOURCE: i have a honeywell cm927
The red flashing light means that there is an issues with the RF comms between control unit and receiver. You can reset by switching the boiler off and back on and then re-sending the temperature signal. You need to check batteries in you thermostat and also the position as the signal could be interfered with or it may be too far away from the receiver.
SOURCE: Vaillant Ecotec boiler. Central Heating
no heat demand from external controls clamp 3-4open ,its on the error codes in the hand book or you can down load one from there web site
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