glow worm 30cxi

[Jan1]

Help!, please...

...I have just moved into a property which has a 30cxi.

It provides domestic hot water just fine, but...
...I now want central heating; turning the programmer to constant; nothing, even with the c/heating thermostat turned fully closed.

Something else is odd; the circulating pump operates when the boiler fires for hot water; and stops a few moments after the gas to the burners is turned off?

Phoned GW tech support; was told that this was not a known problem & that I would need a service.
Any ideas?
I am happy/competent to change the PCB if this is the most likely fault. They seem to cost about £40 on ebay (where I got them for Pottertons on previous houses).

Thanks

Jan

 

[picasso]

As you have hot water the chances are the boiler is fine, could be faulty thermostat but you need someone with a multimeter to find your fault, throwing parts at your boiler is not going to fix it in a hurry.

 

[Jan1]

Thank you for bothering to reply.

I have a multimeter; what would you suggest that I measure?

Why might the pump operate when all that I want is hot water?

Jan

 

[picasso]

The pump needs to operate for hot water, download the instructions for your boiler and it will tell you what voltages to expect depending on how the stat is connected.

 

[Mr Chibs]

Probably no help... I've a 30ci glowworm.
If the heating control is set to summer (sunshine logo) the heating won't fire-up, even if it's on constant.
Might be worth a check before you start clowning around.



Also, on the digital display, you usually get error codes like F4 if there are defective parts.

 

[picasso]

When all else has failed .........

read the instructions.

 

[Jan1]

There are no error codes...

 

[Jan1]

There are no error codes...nor a sunshine setting on my controller.
Jan

 

[Mr Chibs]

https://www.glow-worm.co.uk/glow-worm/cxi-range-157150.pdf

 

[picasso]

I wonder if @Jan1 has the central heating stat (bottom of boiler,left hand side) turned up ?

 

[Jan1]

Yes, the central heating stat to the left of the display is fully clockwise...

 

[Jan1]

Problem solved! though much time wasted first...
...I changed the main PCB; problem as before. (Sent replacement back.)

...then, following the fault tracing chart towards the end of the manual, I saw the advice to look at the interface PCB.

Moved the main PCB to one side and saw that the connector to the interface PCB had come off; pushed it back and all works.

Thanks to all those who posted suggestions.

Jan

 

[Jan1]

A boiler/heating expert who looked at the boiler told me I should replace it (probably meaning, I should pay him to replace it!)

PS ...I'm sure many will want to post "RTFM"...

...they are right!

Jan