We've got a Danfoss TS 715 controller running the pump on our CH system. Recently it's been misbehaving - switch it on (override), and it turns on, then a few seconds later the relay clicks off again (although the light stays on).
Any ideas on what this might be? Knackered relay/other internals? Faulty mains supply to the controller (though this seems unlikely)?
Is it a case of "get another one"?
cheers, clive