Plumbing Questions? Ask a Plumber for Answers ASAP
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Sorry to hear your appliance is having issues, please stand by while I find the answer for you, this is not an immediate service however I will try and respond as soon as possible.What is the model number of your thermostat?
So you have two thermostats (one for upstairs and one for downstairs heating), if the downstairs stat shows no demand for heat (which is shown by the presence of a flame at the top right) even when set to manually ON this points to a faulty thermostat.
Where there is demand for heat shown on the stat but no demand received by the boiler check to see if the zone valve is open, if it is then its likely a faulty micro switch.
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Where the receiver is failing to allow the stats to bind it suggests the receiver is fault and thus a new receiver should be fitted.
Thats just because you have used the override feature, as mentioned if the stats will not pair you need to replace them or the receiver, otherwise leave them disconnect and user the manual override button to turn the boiler on and off when you require heat.