Fault Code Lookup

HVAC Sales Master

437 / Inverter Flash 65

OD Inverter Heat-Sink Temperature Sensor Fault

This code typically points to

Heat-sink sensor reading below 4°F or above 264°F after 10 minutes of operation

Next checks to confirm

Check sensor condition and outdoor inverter section

Escalation

Outdoor unit stops compressor and fan

Reset behavior

Service-soon condition auto clears when inverter sends clear message; service-urgent condition clears by disconnecting and reconnecting outdoor power.

Urgent

Fix now

Need deeper detail?

Retrieve the subcode for this platform:

On thermostat: Menu > Settings > Advanced Settings > Dealer Control Center > Notifications
Review active alarms on homeowner notification screen or in Dealer Control Center > Notifications
For service-app access, press the smart hub commissioning button once
Connect the mobile device to the smart hub when the LED begins blinking green
Use the app as a service tool after system commissioning is already complete (S30 service session auto-logs out after 30 minutes)

Tool required: iComfort Mobile Setup application for service workflow

Source

Residential Communicating Systems Alert Code Guide, p.40

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