62-11637 7–56
P00175 CHECK HIGH SPEED RPM
• ACTIVATION: In Test #8 with the CAN calling for high speed, engine speed is NOT between: 1650 and
1950 rpm.
• UNIT CONTROL: Pretrip will fail and display “PRETRIP FAIL AND COMPLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again, or Alarm may be manually reset using the dis-
play mounted keys 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 in Notes Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Check High Speed Operation.
Refer to procedure for alarm 00038 CHECK HIGH SPEED RPM. Alarm condition must be corrected
and the alarm cleared to continue.
P00177 CHECK EXV (EVXV) SUPERHEAT
• TRIGGER-ON: With the unit running in Test 11, after the control system closes the EVXV to 0%, evapora-
tor pressure fails to drop by 20 psig (1.36 bar) or fails to go below 0 psig / bar OR the EVXV appears not to
be opening to the full capacity position.
• UNIT CONTROL: Pretrip will fail and display “PRETRIP FAIL AND COMPLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again or alarm may be manually reset using the dis-
play mounted keys 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 in Notes Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Check Refrigerant Level
Check refrigerant charge. Refer to Section 8.7.2.
2. Check System Pressures
Install manifold gauge set and check and compare compressor discharge & suction pressures with
those shown on the microprocessor display. Suction and Evaporator Outlet pressures must be above
3 psig (0.2 bar.) Refer to Section 8.9.12 for instruction on comparison.
3. Check EVXV
a. Visually inspect EVXV for damage. Check to see if coil is seated on valve properly.
b. Inspect EVXV coil and wire connections. Verify there is no physical damage to harness, and no
damage, moisture, or corrosion in connectors.
c. Check EVXV operation. See Section 8.9.9.
d. Check basic refrigeration system. Pressures normal. Compressor operation normal.
e. Check the EVXV electrical system for good continuity in all circuits from microprocessor to EVXV.
f. Inspect component and wire connections. No physical damage to harness.
g. Inspect harness connector pins. (See wiring schematic Section 10.)Verify there is no damage,
moisture, or corrosion in connectors.
4. Check EVOT
Check the sensor. Refer to procedure for alarm 00131 CHECK EVAP TEMP SENSOR.
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