Classic Slimline - FF350 - Pilot wont light

[Delboy2424]

I have the above boiler which has worked without issue until a couple of days ago when we started noticing a drop in water temp.

Upon inspection tonight noticed the pilot had gone out but when the water heating was switched on the fan kicked in and a clicking could be heard..I assume the pilot trying to relight.

I have followed the manual for about half hour repeating the same process, eventually getting it lit, now it has gone out again after about 10 mins.

The only thing I have noticed is there is reference to an overheat thermostat switch located on the right of the cpanel and to press this when the pilot goes out, this i understand in the manual should be "proud" if activated so you can "press" it, however it looks and feels like it is jammed - there is no movement in it at all to push in (although the switch housing feels loose..if that makes sense?..its a red colour with a cross on its head) and it sits semi flush with its housing...not sure if related but any ideas?

Thanks

 

[twgas]

sounds to me as though the overheat stat has not activated so pressing it will have no effect what-so-ever.
I think you need a RGI as your problem seems to be gas related.

 

[Delboy2424]

**Update**

Have tried again and timed it - managed to get pilot lit with CH and HW both on, lasted just over 6 mins then pilot and burner went out....it burned well and looked well lit with no distortion in flame height or colour (blue).

Does this still seem a gas issue? - the thermo cut out switch again did not move.

Does this help further?

 

[Agile]

It still sounds like a gas/combustion/safety problem. For obvious reasons we do not give advice to DIYers on these matters.

The obvious advice is to call a competent RGI.

Tony Glazier

 

[twgas]

It may still be the pump, can you check the pump is spinning.

 

[Blooflame]

I have the above boiler which has worked without issue until a couple of days ago when we started noticing a drop in water temp.

Upon inspection tonight noticed the pilot had gone out but when the water heating was switched on the fan kicked in and a clicking could be heard..I assume the pilot trying to relight.

I have followed the manual for about half hour repeating the same process, eventually getting it lit, now it has gone out again after about 10 mins.

The only thing I have noticed is there is reference to an overheat thermostat switch located on the right of the cpanel and to press this when the pilot goes out, this i understand in the manual should be "proud" if activated so you can "press" it, however it looks and feels like it is jammed - there is no movement in it at all to push in (although the switch housing feels loose..if that makes sense?..its a red colour with a cross on its head) and it sits semi flush with its housing...not sure if related but any ideas?

Thanks

Fan running and a clicking noise is good...either there is an intermittent blockage in the temporary pilot section (nightmare) or more likely the gas valve isn't opening consistently. could be a number of reasons. This will need investigation with a meter for resistances.