High flue temp fault

[Jcruze]

Hello,I have had a high temperature flu and replaced the flu switch sensor Still did not remove the fault code Could it possibly be the board The Power interface board of something else? My Mandy Jxi400 does not have the fusable link on the heater,I believe it is built in to the board. Any advise on what to chase next would be appreciated.

 

[Jcruze]

Hello,I have had a high temperature flue fault and replaced the flue switch sensor Still did not remove the fault code Could it possibly be the board The Power interface board of something else? My Mandy Jxi400 does not have the fusable link on the heater,I believe it is built in to the board. Any advise on what to chase next would be appeciated.

 

[ajw22]

Welcome to TFP.

More likely you really have high exhaust temperature due to low flow, scaled up heat exchanger, or a sooted heat exchanger or other internal heater reasons.

 

[anc2514]

Welcome to TFP.

More likely you really have high exhaust temperature due to low flow, scaled up heat exchanger, or a sooted heat exchanger or other internal heater reasons.

Would this mean you have to replace the entire heater?