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Table 16. Module Wiring Troubleshooting
Miswired Module Indication
Recommended Troubleshooting Action
Green LED is not on, module does not
power up
• Determine if both
R
&
C
module terminals are connected.
• Verify voltage is present at module’s
R
&
C
terminals.
Green LED intermittent, module powers
up only when compressor runs
• Determine if
R
&
Y
terminals are wired in reverse.
• Verify modules R and C terminals have a constant source.
Trip LED is on, but system and
compressor check OK
• Verify
Y
terminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when off.
• Verify 24VAC is present across
Y
&
C
when thermostat demand
signal is present. If not,
R
&
C
are reversed wired.
TRIP LED and ALERT LED flashing
together
• Verify
R
and
C
terminals are supplied with 19 - 28VAC.
ALERT Flash CODE 3 displayed
incorrectly (Compressor short cycling)
• Verify
Y
terminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when off.
ALERT Flash Code 5, 6, or 7 displayed
incorrectly (Open Circuit, Open Start
Circuit or Open Run Circuit)
• Verify the compressor run and start wires are routed through the
module’s current sensing holes.
• Verify the
Y
terminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when off.
ALERT Flash Code 6 (Open Start Circuit)
displayed for Code 7 (Open Run Circuit)
or vice-versa
• Verify the compressor run and start wires are routed through the
correct module sensing holes.
ALERT Flash Code 8 displayed incorrectly
(Welded Contactor)
• Determine if module’s
Y
terminal is connected.
• Verify
Y
terminal is connected to 24VAC at contactor coil.
• Verify 24VAC is present across
Y
&
C
when thermostat demand
signal is present. If not,
R
and
C
are reversed wired.
• Verify voltage at contactor coil falls below 0.5VAC when off.
• Review Thermostat Demand Wiring (page 10) for
Y
&
C
wiring.
