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Error code reference

Denso Air Conditioner Error Code E06

Evaporator pipe outlet thermistor (CTS3) failure

Denso codesDenso air conditioner codes
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What the E06 error code actually means

Your Denso air conditioner has detected a problem with a temperature sensor located on the evaporator coil, which is the indoor cooling component. The sensor either lost its connection or has stopped working correctly, so the system cannot accurately monitor temperatures and has stopped normal operation. Checking and reseating the sensor's wiring connection is the first thing to try before considering any part replacements.

Diagnostic procedure

The full E06 procedure

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1
First diagnostic step
Reconnect the CTS3 thermistor and check the connection, then RESET the controller.
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Most common causes of E06

Ranked by how often they cause this code
  1. 1Loose or disconnected CTS3 connector
  2. 2Corroded or damaged connector terminals
  3. 3Failed CTS3 thermistor element
  4. 4Damaged wiring harness
  5. 5Faulty controller board

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Questions people ask about E06

What does E06 mean on a Denso air_conditioner?
E06 indicates a fault with the evaporator pipe outlet thermistor, identified as CTS3. The controller has detected either a short circuit or an open circuit condition on this sensor. CTS3 monitors temperature at the evaporator coil outlet, and without a valid signal, the unit restricts or stops operation to protect the system.
Is it safe to keep running my Denso AC while E06 is active?
Operating the unit while E06 is active is not recommended. The CTS3 thermistor provides temperature data that the controller uses to prevent coil icing and protect compressor operation. Running the system without a valid sensor signal can lead to uncontrolled icing, reduced efficiency, or potential compressor damage over time.
How much does it cost to repair an E06 error on a Denso air conditioner?
If the fault is simply a loose connector, the repair may only involve a service call fee, typically in the range of $75 to $150 depending on your location. If the CTS3 thermistor itself needs replacement, parts and labor combined generally range from $100 to $300. More extensive wiring harness repairs or a controller board replacement would cost more, potentially $250 to $600 or higher.
Can I fix the E06 error myself without calling a technician?
The first step is something most homeowners can safely attempt: locate the CTS3 thermistor connector, unplug it, inspect for visible damage or corrosion, reconnect it firmly, and then reset the controller. If the error returns after this, further diagnosis involving resistance measurements and wiring checks is best handled by a qualified technician familiar with refrigeration control systems.
Will resetting the controller clear the E06 code permanently?
A reset will clear the fault code, but the E06 will return if the underlying problem has not been resolved. If reconnecting the CTS3 thermistor and resetting does not keep the code clear through normal operation, the thermistor element, connector, or wiring harness will need further inspection and likely replacement.

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