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P00187 CHECK HEATER 1 CIRCUIT
This device is checked twice in Pretrip - once in Test 2 and again in Test 7.
• ACTIVATION TEST 2: (unit not running): Normal draw for the 1HTCON1 coil is 0.05 to 1.0 Amps (12
VDC). The circuit tests outside this range.
• ACTIVATION TEST 7: (unit running): Normal draw for the 1HTCON1 heaters is 1.0 to 3.5 Amps (460
VAC). The circuit tests outside this range.
• UNIT CONTROL: Engine and Electric Operation: Pretrip will fail and display “PRETRIP FAIL AND COM-
PLETED”.
• 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). (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:
12 VDC CIRCUIT
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 187. If alarm is present, follow steps 2 thru 5 If alarm is not pres-
ent, follow steps 6 thru 9.
2. Check 1HTCON1
a. Inspect heater contactor coil and wire connections. No damage to coil. Wire connections to con-
tactor coil are tight. No damaged or corroded wires to contactor coil.
b. Check contactor coil resistance. Refer to Section 2.11 for correct electrical values.
3. Check 1HTCON1 Amp Draw
Check 1HTCON1 amp draw. Use Component Test Mode (Section 5.2.4) to test. Refer to Section
2.11 for correct electrical values. View current draw in Component Test Mode screen.
4. Check 1HTCON1 Wiring
Inspect harness & control box connector pins & terminals. (See wiring schematic Section 10.3.) Ver-
ify there is no physical damage to harness, and no damage, moisture, or corrosion in connectors.
5. Check Evaporator High Temperature Switch (EVHTS)
Inspect for open EVHTS per wiring schematic Section 10.3. If open, replace switch as required.
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