Gloworm 30cxi fault

[gazmad]

When my central heating is turned off via the mechanical timer, it still turns on at the times that I had set. I’ve tried turning the radiator temperature to zero, put all the tabs back into the off position and it still comes on twice a day at the times I had set. I thought it was a faulty timer so I have replaced it and it still happens. Could it be a faulty pcb board. The only way to stop it is to turn the boiler off, which means no hot water and with the price of gas at the moment I need to get it sorted.
Has anyone ever seen this before, any help would be appreciated.Thanks

 

[kidgreen61]

If your boiler is firing up at the preset times you mentioned, surely the fault is with the timer?

 

[picasso]

Was your room stat upgraded when you had the cxi fitted?

 

[stem]

I take it you are referring to the "mechanical timer" on the front of the boiler.

Is there some other control elsewhere? Sometimes, when new external controls [programmable thermostat / Nest / Hive etc.,] are fitted the old timer is disconnected, so no longer does anything, because the new controls also have time control built in.

 

[CBW]

Yes more information would be advisable here, additional external controls, is it definitely a CXI? Take a photo of said timer please too.

 

[gazmad]

The timer has been changed and we don’t have any other thermostats or controls, everything is set from the boiler, which has worked perfectly for the last 14 years.

 

[CBW]

The replacement timer, was this brand new or 2nd hand?

 

[gazmad]

It was a refurbished timer, I find it hard to believe that two timers would have the same fault.