Carrier 40MBFAQ - Page 30

40MBFAQ: Service Manual
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30
DIAGNOSIS AND SOLUTION (CONT.)
PC 0L (Low ambient temperature protection)
Description: This is a protection function. When the compressor is off, the outdoor ambient temperature(T4) is lower
than -31
 F (-35  C) for 10s, the air conditioner stops and displays the failure code.
When the compressor is on, the outdoor ambient temperature(T4) is lower than -40F(-40C).for 10s, the air conditioner stops and displays a failure
code. When the outdoor ambient temperature (T4) is no lower than -25.6F (-32C) for 10s, the unit exits protection.
EC 0d(Outdoor unit malfunction Diagnosis and Solution)
Description: The indoor unit detect the outdoor unit is error.
Recommended parts to prepare:
• Outdoor unit
Troubleshooting
?
Is the main board
displaying an error?
,
.
WŽǁĞƌŽīƚŚĞŶƌĞƐƚĂƌƚƚŚĞƵŶŝƚƚǁŽ
ŵŝŶƵƚĞƐůĂƚĞƌŽĞƐƚŚĞŽƵƚĚŽŽƌŵĂŝŶ
board display an error code several
ŵŝŶƵƚĞƐůĂƚĞƌ
No
Yes
Refer to the prescribed steps
ƚŽƌĞƐŽůǀĞƚŚĞŝƐƐƵĞ
Yes