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hi thanks for your response, the thermostat is just fine and is on auto; it's the programme timer that has stopped. The HW and CH is on 24hours, but i can't use the HW CH twice option as the mechanical timer has stopped. I'm trying to understand if the change in thermostat is the cause of...

The timer is a Honeywell ST1000

Hello everyone in an attempt to reduce my heating bills I have just installed an programmable thermostat: replacing an old analogue honeywell with a new honeywell cm901. The thermostat is working just fine but the programme timer is not working, the timer is stuck on the time that i...