Reznor PDF2SF Unit Installation Manual - Manual (Page 36)

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Status LED Status LED Description Status LED Troubleshooting Information
ALERT
Flash Code 3
(Yellow LED)
Short Cycling / Compressor
is running only briefly
• Thermostat demand signal is intermittent
• Low line voltage (contact utility if voltage at disconnect is low)
•
Excessive liquid refrigerant in compressor
• Compressor bearings are seized
ALERT
Flash Code 4
(Yellow LED)
Locked Rotor
• Run capacitor has failed
•
Low line voltage (contact utility if voltage at disconnect is low)
• Check wiring connections
• Excessive liquid refrigerant in compressor
• Compressor bearings are seized
•
Measure compressor oil level
ALERT
Flash Code 5
(Yellow LED)
Open Circuit
• Outdoor unit power disconnect is open
•
Compressor circuit breaker or fuse(s) is open
•
Compressor contactor has failed open
— Check compressor contactor wiring and connectors
— Check for compressor contactor failure (burned, pitted or open)
— Check wiring and connectors between supply and compressor
— Check for low pilot voltage at compressor contactor coil
— High pressure switch is open and requires manual reset
•
Open circuit in compressor supply wiring or connections
• Unusually long compressor protector reset time due to extreme
ambient temperature
• Compressor windings are damaged
— Check compressor motor winding resistance
ALERT
Flash Code 6
(Yellow LED)
Open Start Circuit
Current only in run circuit
• Run capacitor has failed
• Open circuit in compressor start wiring or connections
— Check wiring and connectors between supply and the
compressor S terminal
• Compressor start winding is damaged
— Check compressor motor winding resistance
ALERT
Flash Code 7
(Yellow LED)
Open run circuit
Current only in start circuit
• Open circuit in compressor run wiring or connections
— Check wiring and connectors between supply and the
compressor R terminal
• Compressor run winding is damaged
— Check compressor motor winding resistance
ALERT
Flash Code 8
(Yellow LED)
Welded Contactor
Compressor always runs • Compressor contactor has failed closed
•
Thermostat demand signal not connected to module
ALERT
Flash Code 9
(Yellow LED)
Low Voltage
Control circuit < 17VAC
•
Control circuit transformer is overloaded
• 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 LED’s flashing at same time means control circuit voltage is too low for operation.
Table 15. LED Diagnostics - Continued