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Error code reference
Heat Controller Air Conditioner Error Codes
12 error codes documented with diagnostic procedures.
Have your model number? Get codes specific to your unit.
01Indoor room thermistor (air sensor) open/short circuit error.02Indoor inlet pipe thermistor sensor open/short circuit error.05Communication error between indoor and outdoor units (displayed at indoor unit).06Indoor outlet pipe thermistor sensor open/short circuit error.07Different mode operation error (indoor units operating in conflicting modes).10Indoor fan motor locked error.33Discharge pipe temperature high44Outdoor air thermistor sensor open/short circuit error.45Condenser pipe thermistor sensor open/short circuit error.47Constant discharge pipe thermistor sensor open/short circuit error.51Capacity error53Communication error between indoor and outdoor units (displayed at outdoor unit).
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Step-by-step tests, expected values, wiring diagram references, and verified part numbers.
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Common questions
How do I find the error code on my Heat Controller Air Conditioner?
Most Heat Controller air conditioners show the code directly on the control panel display. If your model has no display, it can be read by entering diagnostic mode with the key sequence for your model. The full procedures include model-specific instructions for reading codes.
Are these codes specific to my model?
The codes here apply broadly to Heat Controller air conditioners. Meanings and diagnostic steps can vary by model and production year, so enter your model number for model-specific information and procedures.
What do I do if my code is not listed?
Some codes are model-specific or only appear in diagnostic mode. Enter your model number to get codes specific to your unit, or contact us. We update the database continuously from manufacturer service documentation.
How much does it cost to access the full diagnostic procedures?
A 3-day pass is $9.95 one-time and gives full access to all brands, codes, and procedures. Monthly access is $29/month with unlimited access to everything including Max AI diagnostics.