It says you must have zones, but nothing about how the zones are formed, TRV according to a number of council websites are considered as forming zones.
Only if smart TRVs each zone must have a boiler lock, standard TRVs do not
what did you do in the end ? change the actuator head or just the micro-switch ?
I replaced just the microswitch. I plugged the L/N of the motor into a test block and the motor was working fine turned into fully open position, which further pointed to the switch. After opening, pressing and depressing the switch wasn't completing the circuit.
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