INSTALLATION INSTRUCTIONS R-410A, Two-Stage Split System Air Conditioner
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Status LED Status LED Description Status LED Troubleshooting Information
Yellow “ALERT”
Flash Code 5
Open High Voltage Circuit
1. Outdoor unit power disconnect is open
2. Compressor circuit breaker or fuse(s) is open
3. Compressor contactor has failed open
• Check compressor contactor wiring and connections
• Check for compressor contactor failure (burned, pitted, open)
• Check wiring and connectors between supply and compressor
• Check for low pilot voltage at compressor contactor coil
4. Open circuit in compressor supply wiring or connections
5. Unusually long compressor protector reset time due to
extreme ambient temperature
6. Compressor windings are damaged
• Check compressor motor winding resistance
Yellow “ALERT”
Flash Code 6
Open Start Circuit
Current only in run circuit
1. Run capacitor has failed
2. Open circuit in compressor start wiring or connections
• Check wiring and connectors between supply and the
compressor “S” terminal
3. Compressor start winding is damaged
• Check compressor motor winding resistance
Yellow “ALERT”
Flash Code 7
Open Run Circuit
Current only in start circuit
1. Open circuit in compressor run wiring or connections
• Check wiring and connectors between supply and the
compressor “R” terminal
2. Compressor run winding is damaged
• Check compressor motor winding resistance
Yellow “ALERT”
Flash Code 8
Welded Contactor
Compressor always runs
continuous operation
1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
Yellow “ALERT”
Flash Code 9
Low Voltage
Control circuit < 17 VAC
1. Control circuit transformer is overloaded
2. Low line voltage (contact utility if voltage at disconnect is low)
• Check wiring connections
Flash Code number corresponds to a number of LED flashes, followed by a pause and then repeated.
TRIP and ALERT LEDs flashing at same time means control circuit voltage is too low for operation.
Reset ALERT Flash code by removing 24VAC power from module (R terminal).
Last stored ALERT Flash code is displayed for one minute after module is powered on. The code must flash a
total of one minute before it will clear.
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