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What is the stat wired in to? Usually there is another control box - timer or similar - somewhere else.
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CH pump given up the ghost?
Although if the boiler says no call for heat it could be the thermostat or boiler circuit board.
Can you hotwire the circuit board on the boiler? With my old boiler the circuit board failed and wouldn't switch on the heating. I ended up having to add a jump cable so the heating circuit was triggered by the HW circuit.
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Motorised valve not fully opening? Often the timer and thermostat open the valve which has a switch and it is the switch output that is wired to the boiler call to heat. When the synchronous motor gets old it doesn't open fully and so doesn't activate the switch.
Howard
Brommers
jellybaby
@stevo_com
Boiler in the new house has decided not to want to heat the rads anymore. No fault code. Seems like the thermostat is just not giving it a call to heat. Reset the boiler and the control panel. Boiler is set to on in heating mode and thermostat up high (definitely past the "click"). Planning on fitting the Tado thermostat tomorrow, hope that fixes it. Any other ideas what could be wrong? Boiler display just has two dashes, which the instructions say no call for heat.