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EarthLinked SCWD-024-1C Quick Start Instructions
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Contents
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SCWD-QS (12/16) Page 532) SystemProblem /Symptom Likely Cause(s) Action/CorrectionA. System doesnot run.Note: Some digitalthermostatshave a built-infive-minute timedelay.1. Thermostat fault. 1. Adjust thermostat settings. / Replace thermostat.2. Power supply problem (AHU /compressor unit).2. Check power supply for adequate phase andvoltage. Check wiring to system and externalbreakers or fuses.3. Control voltage problem. 3. Check for 24V on terminal strip between R and Cterminals.4. Shut off by external thermostator thermostat is defective. 4. Check operation of thermostat.5. System lockout: System off onhigh pressure / low pressureswitches or dischargetemperature switch.5. Reset limit switch. Analyze system for rootcause. Check between Common and X terminalfor 24V, indicating a lock-out condition. Reset ifnecessary by disabling the unit 24V controlpower momentarily.6. Internal component orconnection failure.6. Check for loose wiring. Check components forfailure.7. Compressor contactor notpulling in.7. Check for 24V across contactor. Trace 24Vcircuit and components between “Y” and “C” tolocate fault. Repair or replace as necessary.8. Faulty run capacitor or startcomponents. 8. Test each and replace as necessary.9. Compressor windings shorted orgrounded.9. See compressor diagram/ replace thecompressor. Replace filter drier and runcapacitor.10. SureStart fault10. Check the SureStart to see if the red LED isflashing. Flashing codes are in section“Installation – 7) SureStart” of this manual.11. Nano-PLC fault11. With thermostat calling, verify the inputs andoutputs of the Nano- PLC following the wiringdiagram. Contact tech supportB. System runs forlong period orcontinuously.1. Thermostat fault. 1. Adjust thermostat settings / Replace thermostat.2. Refrigerant undercharged. 2. Repair leak and replace filter drier. Evacuateand recharge system.3. Component failure. 3. Check pressures and electrical circuits forabnormalities.4. Outdoor thermostat notconnected or failed (heatingmode).4. Check outdoor thermostat and electricsupplemental heat operation. Confirm properwiring.5. Reduced air flow.5. Check air ducts for leaks and repair. Checkblower operation. Check air filter(s). Remove airflow restrictions (min.400 CFM/ton).6. Four-way reversing valve isshort circuiting refrigerant andbypassing hot gas to suction.6. Replace four-way reversing valve and filter drier,evacuate, recharge and start-up system.7. Unit undersized. 7. Contact ETI Technical Support at 863-701-0096.C. System blowsfuses or tripscircuit breaker.1. Inadequate circuit ampacity. 1. Note electrical requirement and correct asnecessary.2. Short, loose or improperconnection in field wiring. 2. Check field wiring for problems.Figure 35. System Troubleshooting Chart |
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