62-61753-21
P187 CHECK HEATER 1 CIRCUIT
This device is checked twice in Pretrip - once in Test 2 and again in Test 8.
TRIGGER-ON TEST 2: Normal amps for the HTCON1R relay coil are 0.05 to 1.0 Amps (12 VDC).
The circuit tests outside this range.
TRIGGER-ON TEST 8: Normal amps for the 1HTCON1 heaters are 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 "PRE-TRIP FAIL AND
COMPLETED".
RESET CONDITION: Auto Reset if Pretrip is started again or alarm may be manually reset via key-
pad 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 7-1) Operate the unit through the appropriate modes to see if any active alarm oc-
curs. Continue with the steps below as necessary.
Determine Which Test Triggered This Alarm
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 4 If alarm is not
present, follow steps 5 thru 10.
a. Inspect heater contactor coil and
wire connections.
No damage to coil.
Wire connections to contactor coil are tight.
No damaged or corroded wires to contactor coil.
b. Check contactor coil resistance.
a. Check HTCON1R amp draw.
Use Component Test Mode (Section 5.1.2) to test.
Refer to Section 2.12 for amp values. View current
draw in Data List.
a. Inspect harness & control box
connector pins & terminals. (See
wiring schematic Section 10.)
See Note 2 & Note 5 Page 7.2.
No physical damage to harness.
No damaged or corroded pins.
Check Evaporator High Temperature Switch (EVHTS)
a. 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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