baxi solo2 wont fire

[gaz100uk]

Hi all,

Hopefully I can explain my problem.

We have a Baxi solo2 RS boiler. This morning it hadn’t fired up(has happened before). A while ago it wouldn’t fire up and kept tripping out. When it attempted to fire up, there was a lot of clicking noises coming from the boiler sometimes firing up, but some times after a while the reset button would trip out and pilot light go out. After a lot of process I thought I had narrowed it down to the CH valve. The small little micro switch was lose, it hadn’t been switching on and off probably and had shorted out. I replaced this and every thing has been great. This was about 6 to 8 months ago.

Apart from this morning. No heating or hot water, boiler gone out and reset button tripped. I re-fired it up and the clicking/switching noise has come back. I have checked the micro switch in the valve but this is tightly done up.

Any ideas or advice??
Sorry for the length of post hope it makes sense

 

[corgiman]

Probably the Printed Circuit Board

 

[gaz100uk]

I guess there is no way of testing this to be sure is there. Just have to bite the bullet and fit one i guess

 

[gaz100uk]

Any ideas for testing to see if the pcb i shot? Started OK yesterday but not today....arr
O and as far as i can tell it only dose this when demand for CH and not HW

 

[gas4you]

Boiler doen't know whether it is on for CH or DHW.

Recheck the valves and external controls before buying a pcb.

 

[baxpoti]

Reset on an RS is overheat.

Check the system bypass and installation as per M.I.

 

[EliteHeat]

Reset on an RS is overheat.

Check the system bypass and installation as per M.I.

What's the bypass got to do with the boiler firing in the first instance?