62-61753-21
71 BAD F2 OR F3 FUSE
TRIGGER-ON: F2 &/or F3 has been open for more than 2 seconds: F2, F3
UNIT CONTROL: Engine operation: Alarm Only. If the engine shut off, refer to troubleshooting
steps below to correct.
Standby operation: Additional verification required if the "No Power"
configuration is set for "Installed and Shut Down" the refrigeration system will
shut down with the alarm on and PSCON still energized.
RESET CONDITION: Alarm may be manually reset via keypad or by turning the unit off,
then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 Page 7-1) Operate the unit through the appropriate modes to see if any active alarm
occurs. Continue with the steps below as necessary.
Yes, Check F3.
No, Check F2.
Refer to Section 2.13.
Must be correct rating for circuit. (See wiring schemat-
ic. Section 10.)
c. Inspect fuse & fuse holder.
Terminals tight; No signs of overheating, melting or
discoloration.
a. Use Component Test Mode to test
actual current draw of the circuit.
(Refer to Section 5.1.2.)
Check for voltage between
MPQC-8 and ground.
Component FET or board LED (refer to Table 5-1)
must be illuminated.
View current draw in Data List.
Refer to Section 2.12 for normal current values.
Voltage should be approximately 12 VDC.
b. Check for voltage between
MPQC-4 and ground.
Voltage should be approximately 12 VDC.
Check Speed Relay Circuit
a. Use Component Test Mode to test
actual current draw of the circuit.
(Refer to Section 5.1.2.)
Check for voltage between
MPQC-8 and ground.
Component FET or board LED (refer to Table 5-1)
must be illuminated.
View current draw in Data List.
Refer to Section 2.12 for normal current values.
Voltage should be approximately 12 VDC.
b. Check for voltage between
MPQC-3 and ground.
Voltage should be approximately 12 VDC.
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