I have a Lennox Pulse 21 that quit working so I turned off the power and then turned it back on. The LED light was off prior to doing this but once I turned it off and on the light came on and furnace worked great. It has done this several times. The last time I was able to get it to work by turning it off and on several times. But now it will come on or respond at all. This unit will not heat or cool. The LED light remains off. When the power it turned on there is a humming sound that can be heard. Any ideas where to start please?
The heat exchanger on a pulse needs to
be pressure tested at least every other year. The lennox tech will diagnose the nonworking issue at that time if the exchanger passes the test. Pulses are not DIY furnaces.
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