Harman P68 wont shut down

[snodays700]

When using my Harman P68 when it gets to temp. it keeps burning. I set the room temp to 55 and its keeps burning. and the rooms actual temp is 74. even in stove temp mode it does the same. please help

 

[Bioburner]

Make sure the stoves igniter is in auto not manual. Seems to be a rash of ESP failures this week.

 

[turbosporsche]

Do u have it set to auto or manual. If it's in manual when room temp is met it goes into maintenance mode . Auto mode will allow unit to shut down completely. Mine sometimes takes an hour.. Hope that helps

 

[snodays700]

Do u have it set to auto or manual. If it's in manual when room temp is met it goes into maintenance mode . Auto mode will allow unit to shut down completely. Mine sometimes takes an hour.. Hope that helps

it is in auto, it hasnt shut off all day and it has always been warmer than what the temp is set at by at least 10 deg.

 

[snodays700]

Make sure the stoves igniter is in auto not manual. Seems to be a rash of ESP failures this week.

yes it is in auto always keep in auto

 

[DAKSY]

When was the last time you pulled & cleaned your ESP?

 

[snodays700]

I haven't pulled it out, but I reached in from the back and wiped it off. How would you recommend cleaning it?

 

[DAKSY]

Remove the rear shroud on that side & remove the zipscrew holding the ESP in place, with a 1/4" nut driver or a 1/4 magnetic hex driver.
CAREFULLY pull the ESP straight out of the exhaust port & wipe it clean. I spray some SpeedyWhite glass cleaner on a paper towel to clean mine. Then CAREFULLY insert it back into position & install the screw.

 

[snodays700]

I will have to give that a try tonight. Hopefully that's all it needs

 

[DAKSY]

It might just be the answer. The ESP gets crudded up & the coating prevents the accurate temperature sensing operation...If you bent it AT ALL when you cleaned it from the outside, you'll have to replace it.

 

[snodays700]

Any idea what the cost

 

[DAKSY]

Right round $50. You have to make sure the wiring harnesses are the same color, so you don't have to adjust the dip switches on the control board. They wires are either red or black...

 

[snodays700]

Good info to.know. thanks again

 

[MtDew]

Right round $50. You have to make sure the wiring harnesses are the same color, so you don't have to adjust the dip switches on the control board. They wires are either red or black...

Where did you find a probe for $50? The one I recently bought was almost $80

 

[DAKSY]

Where did you find a probe for $50? The one I recently bought was almost $80

(broken link removed)

 

[MtDew]

(broken link removed)

I'll bookmark that site for future needs. Thanks!

 

[DAKSY]

I'll bookmark that site for future needs. Thanks!

Sure. They also carry the other one with the black wire harness...

 

[P38X2]

Dang. Great price!

 

[rayttt]

I bought My Replacement Control Board from There. Their price was a good price ($225.00).

 

[snodays700]

Right round $50. You have to make sure the wiring harnesses are the same color, so you don't have to adjust the dip switches on the control board. They wires are either red or black...

I took out the esp sensor and cleaned it. Its now polished stainless steel. Put it back in put the stove at 55 deg. The room temp. Was 70 deg and the stove fired back up thinking it was calling for heat.
Now what do I try?

 

[ivanhoe]

Could be the temp knob needs cleaning or replacement. Not reading the desired temp and slightly off calibration.

 

[Bioburner]

eBay seller has three pot switches for Harman board replacement for under $10. I just did them on a pc 45 board Saturday. Not at all hard to do if you have some soldering experience and iron etc.

 

[snodays700]

How do you clean the temp knob

 

[snodays700]

What do the pot switches control?

 

[Bioburner]

What do the pot switches control?

One is the room temp. Another is the fan switch and last is the feed control.