It is wireless, it is the salus 300rf, it is just on the worktop. I was thinking it might be to do with the thermostat in some way. Is it a case of the receiver trying to communicate to the thermostat even though it's off, meaning it's locked?Yes, but if it was left in the on position, you turning it off might have then broken that circuit. As a temporary solution you could link the thermostat out a the boiler end or at the receiver end (if you’re certain it’s wireless), or press the override if it has one.
Are you saying I should unscrew the consol and take the receiver out?