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jdmcniff 11-17-2010 04:20 PM

Reznor udap60 problem..
i have a reznor udap60 hanging garage heater, I just turned it on for the first time, for this season. the exhaust fan comes on, the igniter clicks, it fires up, but when the igniter stops the flame goes out... it will keep repeating this process... The green light on the board is steady when not calling for heat. And when heat is called for it has a steady fast blink.. both normal. I also cleaned the flame sensor with emery paper... it was clean but I did it anyway. the yellow flame led on the board does not come on at all. I also checked the flame sensor with my olm meter and get continuity from the connection spade to the tip.

any ideas??


hvactech126 11-17-2010 04:27 PM

sounds like it is a flame signal problem. clean it with steel wool and then wipe off with a clean rag. if you have a meter that check micro amps, wire meter in series and check current with burners lit. also make sure all burners are igniting.

kenmac 11-17-2010 08:08 PM

Flame sensor goes to ground.. Make sure you have a good ground at the board

jdmcniff 11-18-2010 06:46 PM

I checked mil amps, put meter in series. when the burner starts it was only going to 1... back and forth from 0 to 1.

hvactech126 11-18-2010 07:03 PM

you need to be checking DC micro amps

jdmcniff 11-18-2010 07:44 PM

I have a nice Fluke 87v meter but, I guess I just dont how to use it for more than volts and olms. I had it on the maa setting on the right side of the dial and was getting the 0 to 1 readings. Ive been going thru the manual to figure out how to check for dc micro amps with it.

hvactech126 11-18-2010 08:18 PM

you may not be able to with that meter. the symbol looks like a lowercase u and then and A

jdmcniff 11-19-2010 03:13 PM

Yes my meter has that on the far right on the dial it looks like a backward lower case u and and a with a wavy line over the top. (μA)

heres the meter i have.

put the meter in series with the flame sensor (thermal coupler) call for heat when the burner starts, see what the meter reads?? right

thanks jeff

hvactech126 11-19-2010 05:21 PM

looks like your meter is only for AC on that function. picture not real clear. but looks like sign above is for AC

jdmcniff 11-22-2010 03:42 PM

I do have DC micro amp, ok I hooked it up in series, red to spade on the flame sensor , black to the wire. when the flame came on it was reading a pretty steady 000.1 with a jump .2 once or twice for a split second. with no flame it was 000.0


hvactech126 11-22-2010 04:02 PM

flame signal issue, bad flame sensor, or not in flame properly, or dirty burner as well, remove wire brush burner, or bad board..... you need at least .5 micro amps DC or better, would prefer around 2 micro amps

jdmcniff 11-22-2010 04:17 PM

ok Thanks, I'll try diggin a little deeper. The burner doesn't look to be too user friendly for servicing without tearing the whole works apart.
My biggest fear is the main board is bad.. hoping thats no the case.


jdmcniff 11-22-2010 05:17 PM

Just got done tearing it apart and cleaning and reassembling, actually wasn't too bad. I removed the burner and cleaned (blew it out) looks like new, cleaned the flame sensor again. Put back in and retested.. same results.. 000.1 - 000.2 is this looking like the sensor is bad???


kenmac 11-22-2010 05:41 PM

make sure sensor is getting a good flame around it.. also, check your ground. If all this checks out it's either sensor or board. it will cost less to try new sensor

Car Guy 12-02-2010 01:46 AM

I experienced a similar problem with a Reznor and it was not the fault of the furnace.

My 110 AC power cord had the hot and neutral reversed by accident (it was me and I know the right way) on a three prong plug. Put the hot wire where it was supposed to be and the unit fired right up.

Actually my furnace guy asked me to check this and I told him it was fine, he said check it anyway and so I did and it was wrong.

Maybe a longshot but it can happen.

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