Center Thermostats.Are they Honeywell or clones (thermostat’)?
Discuss What is wrong with my system in the Central Heating Forum area at PlumbersForums.net
Center Thermostats.Are they Honeywell or clones (thermostat’)?
This is a description of what happens with a thermostat that has TPI control. Once the room is up to temperature the thermostat keeps it there by calling for heat with a boiler on/off ratio that matches the time-averaged boiler output to the losses. The flame symbol on the thermostat display won't go out until the room temperature is a degree or so above the set point (the top of the 'proportional band'), e.g. because solar gain is supplying enough heat to the room that the boiler is not needed.The issue now seems like the temp on stat is reached but flame does not go off on the stat and therfore the boiler wants to fire up every few minutes but I I increase the temp to say 20 from 18c then the boiler remains fired up until the stat shows it has reached 20c and again the flame remains on display at that temp level
That's helpful.. My issue was on link 1 and you are right it detects 1 degree difference higher or lower before flame goes off. Baxi seemed to find no fault however still replaced my hot water motorised valve as peace of mind.
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