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critical Honeywell
Error Code Proof of Water Flow Alarm
A high-severity alarm indicating no water flow is detected when the water pump or water valve should be operating.
? What Causes This
Water pump failure, blocked water line, disconnected proof of water flow sensor, or water valve malfunction.
✓ How to Fix It
- Verify water pump is operating.
- Check water line for blockages or kinks.
- Verify proof of water flow sensor connection.
- Contact service personnel.
Source: page 119 of the official manual
From the manual
This error code appears in:
Honeywell Home Thermostat