Check Clutch Circuit
electrical
Description
There is a problem in the clutch coil (CLH) circuit, shorted when energized or open at other times, and the unit alarms only.
Activation Conditions
A problem has been detected in the clutch coil (CLH) circuit. If this alarm is activated while the control system is calling for CLH to be energized, the circuit is detected shorted. If this alarm occurs at any other time, the circuit is detected open.
Unit Behavior
Alarm only.
Reset Conditions
Auto reset when the control system calls for CLH to energize and the coil circuit is normal, or when the control system calls for CLH to be de-energized and the circuit is not shorted or Alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Check Fuses Check F5 and F10. Fuses must be good. Replace fuse(s) as required, clear alarms, restart and check for repeat alarms. 2. Check Coil a. Inspect coil and connector pins and terminals. Verify no damage to coil. Verify no damaged or corroded pins. b. Check resistance of coil. Refer to Section 1.11 for specifications. c. Use Component Test mode (Refer to Section 1.2.4) to test actual current draw of the circuit. Refer to Section 1.11 for specifications. View current draw in Unit Data. Verify the actual current is within the specifications. 3. Check Power and Wiring a. Use Component Test mode (Refer to Section 1.2.4) to energize circuit. Check for power at CLH terminal A and 3MM-11. Minimum 11 VDC. If not, check connectors and wiring between terminals. Verify no damage, moisture or corrosion. b. Check for ground at CLH terminal B (including SP-3) to GND RING1. Good ground. If not, check connectors and wiring between terminals. Verify no damage, moisture or corrosion.