You can check the inside door chart, and it will map out the led light readout for you. just follow the instructions on the panel and it will tell you possible problems and what you may need to fix to make your unit run correctly.
SOURCE: Ruud achiever 90 plus won`t start at times
sounds like you have a heat pump heat pumps dont work below 30* temps you should have some type of backup heat
SOURCE: 2 Rheem Protech 500 thermostats, 1 upstair & 1
Have you checked to make sure that all of the supply registers are open, the air filter is clean and nothing is blocking the return air grill?
It almost sounds like you could be cycling on a limit switch.
Usually on gas furnaces, the blower is controled by the onboard controls, in the cooling mode the thermostat will control the blower.
I would be looking past the thermostat, at the furnace it self.
I hope you find this helpful. If you continue to experience problems, please let us know and we will dig deeper. :)
Paul
SOURCE: have a rheem 90 plus gas furnace, the problem is
Trunthe fan from the automatic position to the on position, if the blower does not come on then you
might have a relay problem. The relay is built into the
board, you may have to replace the board.
SOURCE: Have a rheem 90 plus gas furnace the problem is
At your thermostat turn the fan from auto to on, if the blower motor still does not come on, down at the furnace remove the blower door, turn power off first. Locate the blower motor leads, switch the cool lead which is usually black with the blue wire which is usually medium high.
Make sure while you are at it to see if the blower motor will turn by hand. Put door back on turn on power, leave the fan switch to `on` still. Blower should turn on. If not then either the blower motor is either burned out or you have a line/lolw voltage wiring problem.
You did not state if the outdoor ubit was operating, that will make it easier to troubleshoot.
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