"Fuse link field" error displayed on Jandy LRZ heater

[jpater01]

I had fuse link field message on my lcd disply on Jandy LRZ heater. I tested rollout link for continuity and replaced it. Then heater fired up for several minutes then died again. (no blockage inside as I vacuumed out previous). I replaced control board and fuse link and still get "fuse link field" message. Please advise?
James Paterson

 

[Poolbreh]

It sounds like the rollout is doing it’s job. You most likely have flames coming out the front and the vacuuming didn’t do the job. Maybe soot in the exchanger or ventilation problem, poor or weak blower.

 

[jpater01]

thanks for reply, but flames and not "rolling out". Somehow I think that "fuse link field" message could be false read msg.
I made jumper out of paper clip and put on rollout link and heater fires up (I promptly turned it off to avoid doing any damage heat wise or to electronics.) So, it follows that wires are sound with continuity. Please advise?
James Paterson

 

[Poolbreh]

And new fuse link has continuity?

 

[jpater01]

yes new fuse link has continuity with volt meter.

 

[Poolbreh]

The vent sensor is on the same loop I would check for continuity.

 

[jpater01]

I have checked both rollout and vent sensor for continuity and both are good.
Could it be a water temp sensor giving false message?
James Paterson

 

[Poolbreh]

both sensors are one time use if they both check out it’s the wiring. I would check continuity across the loop.

 

[jpater01]

continuity checks out across the loop both blue wire to control board and orange. I am at a loss now as to what it is, as I have replace control board with new one and both fuse links.
James Paterson

 

[Poolbreh]

I would run test above. I would also check the pressure switch loop and see if it’s disrupting fuse link loop.

 

[jpater01]

pressure switch loop is ok. could it be tempurate high switch that is bad? James Paterson

 

[Poolbreh]

You can test the high limits but I don’t think that’s the problem. Did you get 24vac after fuse link loop? It’s weird it would work with a jumper byt not the fusible links and the fusible links check out. I would use a rust inhibitor on connections and verify 24vac across