Check 3HTCON1 Coil
engine
Description
Heater Contactor 1 in Compartment 3 circuit is shorted or open; the unit alarms only.
Activation Conditions
Heater Contactor 1 in Compartment 3 (3HTCON1) circuit is shorted or open.
Unit Behavior
Engine and Electric Operation: Alarm only.
Reset Conditions
Auto Reset or alarm may be manually reset via keypad or by turning the unit off, then back on again.
Corrective Actions
1. Check 3HTCON1 a. Inspect heater contactor coil and connector. Verify no damage to coil. Verify no damage, moisture, or corrosion in connector. b. Check contactor coil resistance. Refer to Section 2.12 for contactor coil resistance values. Cannot be opened (infinite ohms), shorted (Zero Ohms) or shorted to ground. 2. Check 3HTCON1 Using Component Test Mode a. Use Component Test mode to energize 3HTCON1. (Refer to Section 5.2.4.) Verify Current Draw on Component Test mode Screen. Refer to Section 2.12 for correct electrical values. b. Check coil voltage between A1 and A2. Verify 12 VDC between A1 and A2. c. Check resistance at contacts. Verify contacts are closed at L1-T1, L2-T2, L3-T3. 3. Check 3HTCON1 Wiring - Inspect harness and control box connector pins and terminals. (See wiring schematic Section 8.) Verify no physical damage to harness. Verify no damage, moisture, or corrosion in connectors.