7–73 62-11785
05021 CHECK HTR CNTR TWO
• ACTIVATION: Heater Contactor 2 (1HTCON2) circuit is shorted or open.
• UNIT CONTROL: Alarm only.
• RESET CONDITION: Auto Reset 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, the active
alarm should clear itself (see reset condition above). 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 1HTCON2
a. Inspect contactor coil and connectors. Verify there is no damage to coil, and no damage, moisture,
or corrosion in connector.
b. Check contactor coil resistance. Refer to Section 2.10 for contactor coil resistance values. Cannot
be opened (infinite ohms), shorted (Zero Ohms) or shorted to ground.
2. Check 1HTCON2 Using Component Test Mode
a. Use Component Test Mode to energize 1HTCON2. (Refer to Section 5.2.4.) Verify Current Draw
on Component Test Mode Screen. Refer to Section 2.10 for correct electrical values.
b. Check coil voltage between A1 and A2. Verify 12 VDC between A1 & A2.
c. Check resistance at contacts. Verify contacts are closed at L1-T1, L2-T2, L3-T3.
3. Check 1HTCON2 Wiring - Inspect harness & control box connector pins & terminals. (See wiring sche-
matic Section 10.3.) Verify there is no physical damage to harness, and no damage, moisture, or corro-
sion in connectors.
4. Check CCB status indicator. Refer to Section 2.5.4.
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