Ideal Mexico he24 L9 fault code

[lambchop]

Hi

fault code on the above L9, working my way through the fault flow chart and says to check flue thermistor resistance, couldn't find the component in the wiring diagram, or in changing parts guide. Never worked on this boiler before and access was not great at the back, flue was coming out of left hand side, any help greatly appreciated

 

[Hirstgas]

L9 on the isar is low pressure or pump.

Thort it would have been same

 

[lambchop]

On the flow chart, starts with pump, that's ok. But it does say about flue thermistors, could be a misprint. On wiring diagram it's got a control thermistor but I thought a flue thermistor would come as a pair, pulled the mi.s off the internet

 

[Dotty]

Moved to private forum.

 

[Ermintrude]

It's probably the pump.

 

[lambchop]

Sorry crop, pumps ok, my post not clear, I'm more concerned where the flue thermistors are as can't find them on wiring diagram, parts list and that code halfway down the flow chart says check the resistance of them. Fortunately it worked by resetting couldn't vent the system as it supplies heat to a number of studio flats that was unable to access

never worked on this boiler, just wanted to know if anyone has, if so where are the flue thermisistors or is it a misprint in the m.i's

 

[Hirstgas]

I'm not familiar with the boiler to be honest I know the isar inside out that's why I said pump cos it's L9 on isar.

It might be a dry fire thermistor located up above the main heat ex

 

[GrahamM]

This fault normally due to circulation/overheating etc.
Check pump, check have bypass etc, check for air/blockage, check dry fire thermistor resistance.

 

[Billy Bob Bob]

kill it with a hammer