My three year old Amana 18 SEER with a two stage compressor HP during a heating phase cycles on & off frequently. I noticed in the morning when the outside temp is in the 40's, the thermostat (White-Rogers Humidity Control Touchscreen Thermostat) indicates "system on + 2" which means both compressor stages are on. The air handler blows air at room temp and the outside condenser unit cycles on for 10 -20 seconds every few minutes.
I'm concerned that this isn't normal. My AC Tech said the thermostat should be replaced. I've already replaced the cooling fan on the condenser after it failed last fall. Whether this cycling contributed to having to replace it, I don't know. I'm concerned that the contactor is next to go.
Is this normal? Any ideas?