Amana Air Conditioner: RCC

Re: Cycling On and Off

The compressor contactor energizes and the outdoor unit runs normally for several seconds, then cycles back off.

CHECKOUT:

1. Check Low Voltage at Outdoor Unit

• At the outdoor unit, monitor voltage across the two stat wires.
  • 24VAC Present & Constant + Contactor Cycles--> Step 2. Check 24v at Contactor
  • 24VAC Power Cycles --> Step 4. Test the Thermostat

2. Check 24v at Contactor

• Check for 24VAC across the compressor contact coil as the unit cycles.
  • 24V Power Present & Constant + Contactor Cycles = Bad Contactor
  • 24V Power Cycles --> Step 3. Check Charge/Safeties 

3. Check Charge/Safeties

• Hook-up refrigerant gauges to the pressure ports on the unit.
• Start the compressor with a call for cooling from the thermostat.
• Monitor the refrigerant pressures as the system operates.
  • Normal R-22 Pressures = 60 to 80 psig Suction, 150 to 275 psig Head.
    • Normal Pressures + Contactor Cycles = Bad Pressure Switch
    • Low Pressure + Open Safety = Low Refrigerant Charge

4. Check the Thermostat

• Disconnect the thermostat from the subbase.
• Place a jumper between "R", "Y" and "G".
• Recheck low voltage at outdoor unit.
  • Unit Runs Normally = Bad Thermostat
  • Power Still Cycles --> Check indoor unit for Condensate Overflow Switch or other safeties that break "Y".