Check SV1 Circuit
electrical
Description
A problem was detected in the SV1 coil circuit, shorted in heat or defrost or open in cool, and the unit gives alarm only.
Activation Conditions
A problem has been detected in the SV1 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, 05012 Check ENCU Power Circuit, 00079 Check SV4 Circuit, 05013 Check Clutch Circuit, 00085 Check UL1 Circuit or 00086 Check UL2 Circuit) check F5 and F10. 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. Verify no damage to coil. 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. 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 SV1 terminal A and 3MM-1. Minimum 11 VDC. If not, check connectors and wiring between terminals. Verify no damage, moisture or corrosion. b. Check for ground at SV1 terminal B (including SP-3) to GND RING1. Good ground. If not, check connectors and wiring between terminals. Verify no damage, moisture or corrosion.