That would for any number of reasons that the Flow Switch is not sensing enough water flow to trip the sensor/pressure switch or actual true water flow switch.
Heater will not run or heat, if there is not enough water flowing! The heater will sense this. So, whatever will restrict or stop sufficient water flow is the problem.
Dirty filter
Closed valves
Not enough water in tub or pool - low water level
Clogged pump impeller
Clogged baskets:
at pump or at skimmers
Clog / stopped up plumbing line
And finally, you may have a bad flow switch/sensor
Answers & Comments
Flo ? for Flow Error?
That would for any number of reasons that the Flow Switch is not sensing enough water flow to trip the sensor/pressure switch or actual true water flow switch.
Heater will not run or heat, if there is not enough water flowing!
The heater will sense this. So, whatever will restrict or stop sufficient water flow is the problem.
- Dirty filter
- Closed valves
- Not enough water in tub or pool - low water level
- Clogged pump impeller
- Clogged baskets:
- at pump or at skimmers
- Clog / stopped up plumbing line
And finally, you may have a bad flow switch/sensor