Worcester 24i

Alrite lads, just wandering what you guys think....

Worcester 24i intermittant hw and ch, basically sometimes open hot tap boiler fires, other times it wont fire up until the thermostat on front is turned down and back up.

Ive pulled the pcb out but the relays aernt blackend or anything which usually happens, dont see it been flow switch or aps as it only takes the thermostat to be down and up for it to work. (plus problem on ch too)

I guess thermistor is a possibility but i always thought they was bulletproof on them boilers! (if anyone knows resistance when cold off top of thier head that would be awsome)

Also someone was telling me that on some of them models turning the thermostat down and up acts as a reset, is this true?

Thanks for your help guys

Pcb all day long! The stats are bombproof

as before pcb common fault on these

Thanks for replys!

I was thinking pcb but ive normally only known em go on the relays, where they sound like a clicking machine gun when you touch the stat!

Will give new pcb a go tomorow anyway, thanks again guys!