Honeywell Error Code E352: Sensor Open
How to Fix Honeywell Code E352
- Step 1: Check the wiring connections at the sensor. If easily accessible and visible, ensure the wires are securely connected. Do not open any sealed compartments or remove any screws.
- Step 2: Check the wiring connections at the control board. Again, if easily accessible and visible, ensure the wires are securely connected. Do not open any sealed compartments or remove any screws.
- Step 3: If the wiring appears secure and the problem persists, contact a qualified HVAC technician to diagnose and repair the system.
How to Reset Honeywell Code E352
- 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.
What does E352 mean?
The E352 error code on your Honeywell system indicates that the control board has lost communication with one of its temperature sensors. These sensors are used to monitor temperatures at various points in the system, such as the supply water, return water, or outdoor air. When the control board detects an open circuit (meaning the electrical connection is broken) on one of these sensor lines, it triggers the E352 error. This is important because the system relies on these temperature readings to operate safely and efficiently. Without accurate sensor data, the system may not be able to regulate temperature correctly, potentially leading to overheating, freezing, or inefficient operation. The system will likely lock out and require service to restore normal operation.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Temperature Sensor | — | — |
| Wiring Harness | — | — |
| Control Board | — | — |