TROUBLESHOOTING - CONTINUED
Status LED | Status LED |
| Status LED Troubleshooting Information | |
Description |
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| Short Cycling | • | Thermostat demand signal is intermittent | |
Yellow “ALERT” | / Compressor | • | Low line voltage (contact utility if voltage at disconnect is low) | |
Flash Code 3 | is running only | • | Excessive liquid refrigerant in compressor | |
| briefl y | • | Compressor bearings are seized | |
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| • | Run capacitor has failed | |
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| • | Low line voltage (contact utitlity if voltage at disconnect is | |
Yellow “ALERT” |
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| low) | |
Locked Rotor | • | Check wiring connections | ||
Flash Code 4 | ||||
| • | Excessive liquid refrigerant in compressor | ||
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| • | Compressor bearings are seized | |
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| • | Measure compressor oil level | |
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| • | Outdoor unit power disconnect is open | |
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| • | Compressor circuit breaker or fuse(s) is open | |
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| • | Compressor contactor has failed open | |
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| — Check compressor contactor wiring and connectors | |
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| — Check for compressor contactor failure (burned, pitted | |
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| or open) | |
Yellow “ALERT” |
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| — Check wiring and connectors between supply and | |
Open Circuit |
| compressor | ||
Flash Code 5 |
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| — Check for low pilot voltage at compressor contactor coil | ||
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| — High pressure switch is open and requires manual reset | |
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| • | Open circuit in compressor supply wiring or connections | |
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| • Unusually long compressor protector reset time due to extreme | ||
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| ambient temperature | |
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| • | Compressor windings are damaged | |
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| — Check compressor motor winding resistance | |
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| • | Run capacitor has failed | |
| Open Start Circuit | • | Open circuit in compressor start wiring or connections | |
Yellow “ALERT” |
| — Check wiring and connectors between supply and the | ||
Current only in |
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Flash Code 6 |
| compressor S terminal | ||
run circuit |
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| • | Compressor start winding is damaged | ||
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| — Check compressor motor winding resistance | |
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| • | Open circuit in compressor run wiring or connections | |
Yellow “ALERT” | Open run circuit |
| — Check wiring and connectors between supply and the | |
Current only in |
| compressor R terminal | ||
Flash Code 7 |
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start circuit | • | Compressor run winding is damaged | ||
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| — Check compressor motor winding resistance | |
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Yellow “ALERT” | Welded Contactor | • | Compressor contactor has failed closed | |
Compressor | ||||
Flash Code 8 | • | Thermostat demand signal not connected to module | ||
always runs | ||||
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Yellow “ALERT” | Low Voltage | • | Control circuit transformer is overloaded | |
Control circuit | • | Low line voltage (contact utility if voltage at disconnect is low) | ||
Flash Code 9 | ||||
< 17VAC | • | Check wiring connections | ||
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* Flash code number corresponds to a number of LED fl ashes, followed by a pause and then repeated. Trip and alert LED’s fl ashing at same time means control circuit voltage is too low for operation.
Table 4. LED Diagnostics - Continued
18
