7
−
90
62-11389
Alarm
NO.
Steps
Alarm/Cause
Corrective Action
P188 CHECK HEATER 2 CIRCUIT - Continued
460
VAC
CIR-
CUIT
6
Check Amp Draw of 1HTCON2 Heater Circuit
a. With the unit running and calling for
pull up in, use a clamp on ammeter
to check the current draw of all 3
legs.
Must be within range shown in Section 2.11 for all
three legs.
b. Check fuses for heater elements
F10, F11, and F12 must not be blown.
c. Check voltage at 1HTCON2 con-
tacts.
Must be within range shown in Section2.11for L1-L2,
L1-L3, and L2-L3.
Must be within range shown in Section 2.11 for
T1-T2, T1-T3, and T2-T3.
7
Check Heater Elements
a. Check heater elements with the unit
Off.
No visual physical damage
Remove and replace if damaged
b. Check heater element resistance.
Check from “T” terminals on HTCON2 contactor. See
section 2.11 for correct resistance.
8
Check Heater Element Connections
Inspect high voltage heater connec-
tions at evaporator.
No corrosion, water damage or burning /
discoloration.
Remove, repair, or replace if required.
9
Verify Accuracy of AC Current Sensor
Put microprocessor in PC Mode. Re-
fer to Section 5.3 page 5
−
3.
Must have 0 AC1 Amps and 0 AC2 Amps in Unit
Data.