Isar 35HE

[missplumb]

Hi, i have an Isar 35He (i know, prepare to be kicked but it was a freebie from the rep). last week it started playing up, going to LF fault after trying to light 3 times. we changed the flame sensor and also the ignition electrode as its been booming on ignition lately. it ran ok until today and now the LF fault is appearing again, but only when trying to switch the hot water, heating is fine. Its been a few years since i last looked in one of these small boilers. the gas pressures are ok, the cartrisge for the diverter was changed a few years ago, could this have gone again?? or maybe the gas valve. Sods law this thing is gonna break down completely once all the merchants have closed for xmas so wanna try sort it before then.
Any help is appreciated.

wayne

 

[Millsy 82]

Weak spark from generator? The ignition electrodes bend out of place.

 

[lame plumber]

bst buy a main pcb and controls pcb and linking wire ready for xmas 🙂

 

[Ermintrude]

I'd check earth to PCb and Earth from spark electrode

 

[Millsy 82]

bst buy a main pcb and controls pcb and linking wire ready for xmas 🙂

Why stop there? New boiler will give you something to do to get away from the family on Christmas afternoon!

 

[Billy Bob Bob]

Hi, i have an Isar 35He (i know, prepare to be kicked but it was a freebie from the rep). last week it started playing up, going to LF fault after trying to light 3 times. we changed the flame sensor and also the ignition electrode as its been booming on ignition lately. it ran ok until today and now the LF fault is appearing again, but only when trying to switch the hot water, heating is fine. Its been a few years since i last looked in one of these small boilers. the gas pressures are ok, the cartrisge for the diverter was changed a few years ago, could this have gone again?? or maybe the gas valve. Sods law this thing is gonna break down completely once all the merchants have closed for xmas so wanna try sort it before then.
Any help is appreciated.

wayne

check gas pressures at meter and inlet before going further,send me your gsr info,you can go in the gsr only forum then,more access to boiler faults