OMEGA-VSHPe.F-IOM-2205
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Troubleshooting Guide : Chassis Low Voltage Controls
Troubleshooting Low Voltage Chassis Controls
Troubleshoot chassis low voltage using the low voltage chassis harness without the need to pull out chassis or re-
move chassis top cover. Check resistance readings using a multi-meter probe to confirm continuity across: safeties
(HPS, LPS), sensors (EWT, LWT, RST) and valves (ASOV, REV).
HPS - High Pressure Switch:
• Check continuity between that switch is Normally Closed.
LPS - Low Pressure Switch
• Check continuity between that switch is Normally Closed.
RST - Refrigerant Suction Temperature Sensor
• Check resistance for 10KOhm sensor across RST and Common (white).
EWT - Entering Water Temperature Sensor
• Check resistance for 10KOhm sensor across EWT & Common (white).
LWT - Leaving Water Temperature Sensor
• Check resistance for 10KOhm sensor across LWT & Common (white).
REV-VALVE - Reversing Valve Solenoid
• Check for short to ground faults.
2-Way ASOV - 2-Way Zone Valve
• Check for short to ground faults.
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