Nordyne R-410A Installation And User Manual page 17

Miswired Module Indication
Green LED is not on, module
does not power up
Green LED intermittent,
module powers up only when
compressor runs
Trip LED is on, but system and
compressor check OK
TRIP LED and ALERT LED
fl ashing together
ALERT Flash CODE 3 displayed
incorrectly (Compressor short
cycling)
ALERT Flash Code 5, 6, or 7
displayed incorrectly
Circuit, Open Start Circuit or
Open Run Circuit)
ALERT Flash Code 6 (Open
Start Circuit) displayed
Code 7 (Open Run Circuit) or
vice-versa
ALERT Flash Code 8 displayed
incorrectly (Welded Contactor)
TROUBLESHOOTING - CONTINUED
Recommended Troubleshooting Action
• Determine if both R & C module terminals are connected.
• Verify voltage is present at module's R & C terminals.
• Determine if R & Y terminals are wired in reverse.
• Verify modules R and C terminals have a constant source.
• 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.
• Verify R and C terminals are supplied with 19 - 28VAC.
• Verify Y terminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when
off.
• Verify the compressor run and start wires are routed
through the module's current sensing holes.
(Open • Verify the Y terminal is connected to 24VAC at contactor
coil.
• Verify voltage at contactor coil falls below 0.5VAC when
off.
for • Verify the compressor run and start wires are routed
through the correct module sensing holes.
• 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.
Table 5. Module Wiring Troubleshooting
17