Honeywell Error Code E353: Sensor Short
How to Fix Honeywell Code E353
- Step 1: Check the system air filter. A severely clogged filter can sometimes cause unusual temperature readings and indirectly trigger sensor errors. Replace it if dirty.
- Step 2: Power cycle the system. Turn off the power to your heating/cooling system at the breaker for 5 minutes, then turn it back on. This can sometimes reset the control board and clear the error.
- Step 3: If the error persists after these steps, contact a qualified HVAC technician to diagnose and repair the problem.
How to Reset Honeywell Code E353
- Remove the thermostat from its wall plate.
- Remove the batteries and wait 30 seconds.
- Reinsert the batteries and snap the thermostat back onto the wall plate.
- If the error persists, perform a factory reset through the menu: Menu > Preferences > Restore Factory Defaults.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Honeywell Error Code E353 Mean?
The Honeywell E353 error code indicates a short circuit has been detected in one of the temperature sensors. These sensors are used to monitor temperatures at various points in your heating or cooling system, such as the supply air, return air, or outdoor temperature. A short circuit means there's an unintended electrical connection, causing the sensor to send incorrect readings to the control board. This can prevent your system from operating correctly, as the control board relies on accurate sensor data to regulate heating and cooling cycles. The system will likely shut down to prevent further issues or potential damage from incorrect operation.
Common Causes
- Faulty temperature sensor: The sensor itself has failed internally, creating a short circuit.
- Wiring issue: Damaged or corroded wiring connecting the sensor to the control board is causing a short.
- Control board malfunction: The control board is misinterpreting the sensor signal or is causing the short itself.
- Moisture intrusion: Water or condensation has entered the sensor or wiring, creating a short circuit path.
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| System displays E353 error | Disconnect the suspect sensor from the control board and measure the resistance across the sensor terminals using a multimeter. | Resistance should be within the sensor's specified range (typically a few thousand ohms at room temperature). A reading of 0 ohms or very low resistance indicates a short. |
| Sensor resistance is shorted | Inspect the wiring harness and connections between the sensor and the control board for any signs of damage, corrosion, or moisture. | Wiring and connections should be clean, dry, and free from damage. |
| Wiring appears OK | With the sensor disconnected, measure the voltage at the control board terminals where the sensor connects. | Voltage should be very low or zero. High voltage may indicate a problem with the control board. |
| Wiring is shorted | Perform a continuity test from each wire to ground. | Should read open. Short to ground indicates damaged wiring. |
Applicable Honeywell Models
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Temperature Sensor | — | — | — |
| Wiring Harness | — | — | — |
| Control Board | — | — | — |
Related Codes on Same Models
Other codes that affect the same Honeywell model families as E353.
| Code | Description | Severity |
|---|---|---|
| E1 | Communication Error | Warning |
| E2 | Sensor Fault | Warning |
| E3 | EEPROM Error | Warning |
| E350 | Low Battery | Info |
| E351 | Equipment Fault | Warning |
| E352 | Sensor Open | Warning |
| E4 | Short Cycle Protection | Warning |
| E5 | Wiring Error | Warning |