ELECTRICAL TROUBLESHOOTING CHART - COOLING
24K BTU
NO COOLING OPERATION
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| Before continuing | |
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| check for Error | |
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| Insure that Fuses |
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| Codes, see | ||||
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| are good and/or that |
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| electronics control | |||
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| Circuit Breakers are |
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| diagnostics and | |||
| on and voltage is 208/230 |
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| test mode, page 15 | |
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| O.K. |
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Compressor and outdoor fan motor run but indoor blower does not run
Yes
Indoor blower runs but outdoor fan motor and compressor do not run
Yes
No
Set thermostat to "Cool," move the Temp. lever below the present Room Temp.
O.K.
Compressor outdoor fan motor and indoor blower should now operate
Yes
See Refrigerant Circuit diagnosis if unit still is not cooling properly
Nothing operates, entire system appears dead
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No | Yes | |
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Line voltage present at the Transformer Primary
Yes
24 Volts at
“R” Terminal on board
Yes
24 Volts present at Y terminals on
Yes
No
No
No
Check Supply Circuit’s jumper at transformer. If okay, replace board
Problems indicated with
Control Transformer replace board
Problems indicated with Room Thermostat or Control Wiring
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| 208/230 Volts present |
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24V at |
| Defective |
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| at #1 relay and “OD” |
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| terminal on board? | No |
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| defective control wiring |
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control wiring? | No |
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or transformer |
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| Yes |
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Yes |
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| 208/230 Volts present |
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| at compressor’s |
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| No |
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| contactor? |
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| Yes |
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| Yes |
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| No | |
Is Line Voltage present |
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| Problems indicated |
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| in Blower Relay |
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at Motor Leads? | No |
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| of board |
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| Supply Circuit |
| Is Locked Rotor |
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| Yes |
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| problems, loose |
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| Connections, or bad |
| Voltage a minimum of |
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| No | |||||||
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| Relays/Board | 197 Volts? |
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| Yes | |
Check Capacitor, is |
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| Replace Capacitor |
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Capacitor Good? | No |
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| Replace Capacitor |
| Are Capacitor and (if |
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| and/or Start Assist |
| so equipped) Start |
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| Yes |
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| Device | No | Assist good? |
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| Possible motor |
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| Yes | ||
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Motor should run |
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| problem indicated. |
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No |
| Check motor |
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| thoroughly |
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| Allow ample time |
| Have System |
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| for pressures to | No | Pressures Equalized? |
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| equalize |
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| Yes | |
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| Possible Compressor |
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| problem indicated. |
| Compressor should |
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| No | ||||||
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| See Compressor |
| run |
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| Checks |
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Replace board
Check contactor
If defective replace
Compressor and outdoor fan motor should now operate
Yes
See Refrigerant
Circuit Diagnosis
if unit still is not
cooling properly
41
