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mts200b

  1. R

    Honeywell ST6400C Programmer reboots itself when CH+HW programs turn on

    Hi - I have inherited an old ST6400C when we moved in 7 years ago. I'd guess its 15 years old looking at the agr of the boiler etc. Generally been working OK but I recently replaced the mechanical dial wired thermostat ( see pic ) with a meross mts200b ( see pic ). Since then ( it may only be...
  2. S

    Help wiring a new thermostat (Meross MTS200B)

    I am replacing my old Drayton RTS1 thermostat with the Meross MTS200B and I don't get the heating switching on. I thought it was going to be straightforward but at this point better to ask for help than screwing something. The old thermostat wiring is this one: The new thermostat has this...
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