62-11389
7−89
Alarm
NO.
Steps Alarm/Cause Corrective Action
P188 CHECK HEATER 2 CIRCUIT
This device is checked twice in Pretrip - once in Test 2 and again in Test 8.
• TRIGGER–ON TEST 2 (unit not running): Normal draw for the 1HTCON2 contactor coil is 0.05 to
2.0 Amps (12 VDC). The circuit tests outside this range.
• TRIGGER–ON TEST 8 (unit running): Normal draw for the 1HTCON2 heaters is 1.0 to 3.5 Amps
(460 VAC). The circuit tests outside this range.
• UNIT CONTROL: Engine and Standby Operation: Pretrip will fail and display
“PRETRIP FAIL AND COMPLETED”.
• RESET CONDITION: Auto Reset if Pretrip is started again, or 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). (See Note 1 page 7−2.) Operate the unit through the appropriate modes to see if any active alarm
occurs. Continue with the steps below as necessary.
1 Determine Which Test This Alarm Occurred In
a. Review active alarm list. Make a note of all alarms.
b. Clear active alarm list.
c. Restart and monitor Pretrip. Stop Pretrip during Test #3 by holding = Key for 6
seconds.
d. Review active alarm list for Alarm
188.
If alarm is present, follow steps 2 thru 4 If alarm is
not present, follow steps 5 thru 10.
12 VDC
CIR-
CUIT
2 Check 1HTCON2
a. Inspect heater contactor coil and
wire connections.
No damage to coil.
No damage, moisture, or corrosion in connections.
b. Check contactor coil resistance. Refer to Section 2.12.
3 Check 1HTCON2 Amp Draw
Check 1HTCON2 amp draw. Use Component Test Mode (Section 5.2.2) to test.
Refer to Section 2.12 for correct electrical values.
View current draw in Data List.
4 Check 1HTCON2 Wiring
Inspect harness & control box con-
nector pins & terminals. (See wiring
schematic Section 10.)
No physical damage to harness.
No damage, moisture, or corrosion in connectors.
5 Check Evaporator High Temperature Switch (EVHTS)
Inspect for open EVHTS per wiring
schematic Section 10.
If open, replace switch as required.
Additional steps on the next page.
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