MITSUBISHI ELECTRIC MR SLIM MSZ SERIES General Troubleshooting
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
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86%
CONF
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Indoor Coil Thermistor
The thermistor monitors the evaporator temperature to prevent coil icing. If the resistance deviates from the manufacturer's Ohm-temperature curve (NTC failure), the control board detects an implausible voltage and enters a protection lockout, signaled by a 2-blink green light pattern.
SKU: E12-C34-307
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|
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8%
CONF
|
Indoor Power P.C. Board
This board manages the DC communication signal (S2/S3 lines) between the indoor and outdoor units. A failure in the optocoupler or logic circuit—frequently occurring after a power outage or surge—prevents the handshake required to energize the outdoor compressor, resulting in a continuous communication error blink.
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|
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6%
CONF
|
Condensate Pump Safety Switch
On units with internal or external condensate pumps, a full reservoir or a failed microswitch in the pump assembly will break the interlock circuit. This prevents the unit from running to avoid water damage, often mimicking a standby or error state with a blinking LED.
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DIY Repair Guide
Watch exactly how to replace the Indoor Coil Thermistor.
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.