Faulty clock on boiler ?

ps2659

I have a glowworm central heating boiler and the timer clock works for a couple of weeks then stops working and starts again after a few days. Does it need a new clock and would this be easy to fit myself or do I need an engineer.
Grateful for any help.

Owain_Moneysaver

If you could post the exact model number ... heating only or heating/hot water?

It is probably possible to change a couple of wiring links inside the boiler so it completely ignores the internal clock, and wire in an external clock or programmable thermostat to a couple of terminals. However it may not be quite as simple as that depending on what sort of installation your system had in the first place.

ps2659

Owain_Moneysaver wrote: »

If you could post the exact model number ... heating only or heating/hot water?

It is probably possible to change a couple of wiring links inside the boiler so it completely ignores the internal clock, and wire in an external clock or programmable thermostat to a couple of terminals. However it may not be quite as simple as that depending on what sort of installation your system had in the first place.

Thanks for your reply the model no is 24 cxi condensing combination boiler.

Owain_Moneysaver

That's one with an inbuilt digital programmer? Oh dear, never mind.

To use an external clock you need to disable the internal digital clock. This is done through keypresses, so if the internal clock module is faulty you'd probably need a new clock module anyway.

If the display flashes F and a number that is an internal fault code - post that and I can check the manual - which can be downloaded from
http://www.glow-worm.co.uk/stepone/data/downloads_sd/88/00/00/ultracom_cxi_installation_manual.pdf
and would suggest a fault with the boiler or installation rather than with the programmer itself.

If the clock is faulty it could be either the user interface board or the main boiler circuit board (or both). The trade price of the user interface is £94 and main circuit board £95 (both + VAT). (https://www.mjtcontrols.co.uk) It would relly need a Glow worm engineer with diagnostics kit to tell which or what needed changing.

There should be a 2 year parts and labour warranty on that boiler and the installation/benchmark certificate should tell you when it was installed.

Another possiblilty might be the electrical supply to the boiler has intermittent faults and the clock is resetting every time it loses power?

ps2659

Owain_Moneysaver wrote: »

That's one with an inbuilt digital programmer? Oh dear, never mind.

To use an external clock you need to disable the internal digital clock. This is done through keypresses, so if the internal clock module is faulty you'd probably need a new clock module anyway.

If the display flashes F and a number that is an internal fault code - post that and I can check the manual - which can be downloaded from
http://www.glow-worm.co.uk/stepone/data/downloads_sd/88/00/00/ultracom_cxi_installation_manual.pdf
and would suggest a fault with the boiler or installation rather than with the programmer itself.

If the clock is faulty it could be either the user interface board or the main boiler circuit board (or both). The trade price of the user interface is £94 and main circuit board £95 (both + VAT). (www.mjtcontrols.co.uk) It would relly need a Glow worm engineer with diagnostics kit to tell which or what needed changing.

There should be a 2 year parts and labour warranty on that boiler and the installation/benchmark certificate should tell you when it was installed.

Another possiblilty might be the electrical supply to the boiler has intermittent faults and the clock is resetting every time it loses power?

I have recently had the boiler moved due to an extension we are having and asked about a honeywell room stat to be connected an electrician connected one which never worked and the problems soon started after he called back and disconected the stat the clock started to work again and then stopped and no dought wil start again from what you say this may have caused damage to the board unfortuanetly the biler is 6 years old, I do have home assistance with my boiler do you think I would be covered and if not do you know the cost to call out glow worm.Many thanks

gas4you

Owain_Moneysaver wrote: »

Another possiblilty might be the electrical supply to the boiler has intermittent faults and the clock is resetting every time it loses power?

Could also be that he has rewired it incorrectly, with the permanent live and switched live the wrong way round, or missed the permanent live completely.

Owain_Moneysaver

ps2659 wrote: »

I have recently had the boiler moved due to an extension we are having and asked about a honeywell room stat to be connected an electrician connected one which never worked and the problems soon started after he called back and disconected the stat the clock started to work again and then stopped and no dought wil start again from what you say this may have caused damage to the board unfortuanetly the biler is 6 years old, I do have home assistance with my boiler do you think I would be covered and if not do you know the cost to call out glow worm.Many thanks

I have no idea, but if the boiler has been damaged by the electrician fitting the wrong sort of stat (and that boiler has both 240V AC and 24V switching connections) then it's up to the electrician to cover the cost of repair under his professional indemnity insurance.