AAON M1-011 - Manual (Page 37)

37
No Cooling – Compressor Will Not Run
No Power to
Contactor
Power to
Contactor,
All 3 Legs
Transformer Open
Stuck Compressor
Grounded Winding
Motor Winding Open
High Pressure Switch Open
Control Panel Not Set for Cooling
Thermostat Not Calling for Cooling
Low Pressure Switch Open
Power to
Unit
No Power
Unit
Check Unit Fuses
and Windings
Check Circuit
Breaker at Power
Distribution Panel
Compressor Low Ambient Lockout Open
(Temperature Outside Below 55 °F)
Broken or Loose Control
Contactor
Open
Contactor
Closed
No 24 Volt Power to
Holding Coil
Compressor
Hums
24 Volt Power to
Holding Coil
Holding Coil
Burned Out
Replace
Contactor
Compressor Does
Not Hum
Reverse Leads
Compressor Runs
Compressor Does
Not Run
Power to
Compressor,
All 3 Legs
No Power to
Compressor
Broken Leads Replace Leads
Motor Winding Open
Internal Overload Open
Replace
Compressor
If Compressor Dome Is
Hot, Then It May Be
Locked Out on Internal
Overload. Wait for
Reset. It Could Take
As Long As 2 Hours.