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Went to a family dollar with a roof top unit and at the time could only check right above the drop ceiling, where there was a return and supply flex and a piece of square duct going through the roof and a novar control board mounted on the duct with it looked like 6 or 7 wires on it and 3 wires going to an alarm.. there was no power on the board and the fuse in the board was NOT blown.. i could only see that..i couldnt get to the roof.. have to wait till friday to come back with a tall enough ladder.. but the call came in cause of the alarm went off and they could smell burning.. wonder if anyone ever worked on these boards? maybe u could help me? thank you!.

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Sounds like a smoke detector to me. usually they just break the red or the green through a relay, if it smells smoke. could be dust burning off the heat strips first use, or you could get on the roof and find burned wires or motor. lots of old wires burning up with heat strips kicking in this time of year. i usually have em turn off alarm so fire dept wont come and turn to max heat and burn off the strips , measure amps, check wires, and all relays etc. you may have to bypass smoke detector till done. then return to correct "as found" wiring and reset alarms. hopefully no call backs. good luck.

Posted on Nov 21, 2008

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