Check SV4 Circuit
electrical
Description
A problem was detected in the SV4 coil circuit, shorted in heat or defrost and open in cool; alarm only.
Activation Conditions
A problem has been detected in the SV4 coil circuit. If this alarm is activated while the unit is operating in heat or defrost, the circuit is detected shorted. If this alarm is activated while the unit is operating in cool, the circuit is detected open.
Unit Behavior
Alarm only.
Reset Conditions
Auto reset when the control system calls for SV1 to energize (heat, defrost or pulse) and the SV1 coil circuit is normal, or when the control system calls for SV1 to be de-energized (cooling) 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 for Additional Alarms: If this alarm is activated in conjunction with other alarms (00031 Failed to Start - Auto Mode, 00041 Engine Stalled, 05012 Check ENCU Power Circuit, 00078 Check SV1 Circuit, 05013 Check Clutch Circuit, 00085 Check UL1 Circuit or 00086 Check UL2 Circuit) check F2 and F11. Fuses must be good. Replace fuse as required. Clear alarms, restart and check for repeat alarm(s). 2. Check Coil a. Inspect coil and connector pins and terminals. No damage to coil. No damaged or corroded pins. b. Check resistance of coil. Refer to Section 2.11 for specifications. c. Use Component Test mode (Refer to Section 5.2.4) to test actual current draw of the circuit. Refer to Section 2.11 for specifications. Verify that the actual current is within the specifications. 3. Check Power and Wiring a. Use Component Test mode (Refer to Section 5.2.4) to energize circuit. Check for power at SV4 terminal A and PM-20. Minimum 11 VDC. If not, check connectors and wiring between terminals. Verify that there is no damage, moisture or corrosion. b. Check for ground at SV4 terminal B (including SP-10) to GND RING1. Good ground. If not, check connectors and wiring between terminals. Verify that there is no damage, moisture or corrosion.