Re: Boiler starts whenever the Room Stat calls for Heat - even when the Programmer is
Thanks for the updated information.
The voltages are OK but there are a couple which may appear strange to you
Between 6 (Mains Live) & 4 (Switched Live) - 189 ~ V
(with Boiler NOT Fired & Multimeter Red on Terminal 6 )
Between 6 (Mains Live) & 4 (Switched Live) - 150 ~ V
(with Boiler NOT Fired & Multimeter Red on Terminal 4)
These are due to back-feed from the V4073A motorized valve. This contains a complicated arrangement of microswitches, resistors and a diode, which allows the valve to stop in mid-position.
D C Voltage
Between 6 (Mains Live) & 4 (Switched Live) - 12 V (with Boiler NOT Fired)
This will be from the motorised valve. The diode acts as a half-wave rectifier to the AC current and one of the resistors reduces the voltage.
Several post earlier I told you to cut Links 1, 4, 5 and 6 in the Honeywell wiring centre.
Have you done this?
To make it quite clear, this is not me taking a stab in the dark, to see if it works. They are Honeywell's own instructions!
Link 1 is cut because you have a Programmer
Link 4 is cut because you have a mid-position valve
Link 5 is cut because you have a mid-position valve
Link 6 is cut because you have pump overrun.
There is no point going any further until you have cut these links!