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