My older Accentra has been great and reliable, I do full cleaning every 1/2 ton or so. Now the distribution blowers do not activate and the stove reverts to minimal burn shortly after starting. Everything including the distribution blowers works fine in test mode. The ESP probe is clean with normal resistance. No blinking status lights. I did power-off reset. Happens in both room temp and constant burn modes, temp dial high well above room temp. I’m thinking a safety function is kicking in and since the ESP probe seems ok my next step is board replacement. I’m no pellet stove expert, is this the appropriate next step? Thanks.
Accentra 52i insert distribution blower good in test mode but doesn’t activate with normal operation.
- Thread starter GalbraithPellet
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Whitenuckler
Minister of Fire
I would say try a new control card after making sure to set all the dip switches. The red and black ESP probes are not the same" The red one is a k type thermocouple and the old black ones were a thermistor type, basically the same as your room sensor" Double check your ESP probe type and re-confirm it's good.
Thanks Whitenuckler. Yes, I will check the dip switch positions on a new board. My ESP probe is a red one, I looked up the expected resistance and mine matches. Don't know any other way to confirm ESP normal function. I might just get a new one along with a new board to be sure. I appreciate your input.
Whitenuckler
Minister of Fire
Normally if the ESP is totally bad the board will give a fault. They need to do that because it's used for protection as well. They even check the room probe. I was starting to forget the difference between the probes. I did remember there was a huge change when they went to red. The old black is a thermocouple so you check ohms and millivolts. The new red one just ohms. The chart with dip swicthes should should come in the box and it is on-line here too. If you had the factory DDM tool it could be checked.
unfortunately I believe you can't, the red esp's (a K type thermocouple) is only compatible with some of the newer control boards than what you have, if you want specifics i can give you control board part numbers that are compatible with the red esp's monday but I'm almost certain the older two knob boards can't use the red esp
yes with an electrical multimeter you can test all the harman temp probes. red ones are as lbcynya said, between 1,000 to 1,100 ohms of resistance depending on what your room temp is (remember if the stove has been off for a while the probe may be much colder from the cold air outside coming through the pipe, i typically take them out to test them between 67-72 degrees)
All other ESP probes that are NOT red should read around 650,000 to 550,000 ohms resistance, and lastly the room sensing probe should be around 3,600 to 3,300 ohms resistance.
After taking a good initial read you can breath on them or use any heat source and the resistance should lower as the probe heats up except the red which should rise, hope this helps.
Follow-up: after control board replacement all works well. Thanks for input.
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