What does SF mean on a Hayward heater?

SF (Sensor Failure) indicates that the temperature sensor (thermistor) is not getting good data to the circuit board. Check the wiring. If the wiring is Ok and the error persists, replace the sensor.

How do you change a Hayward thermistor?

To replace the thermistor:

Turn pump, gas supply, and heater power “OFF”.
Drain the heat exchanger of all water.
Remove the front access panel.
Remove the control box cover.
Unplug the thermistor connector from the ignition control board.

How to troubleshoot a Hayward Universal pool heater?

Troubleshooting chart for Hayward Universal H-Series electronic pool heaters with a digital display, models H150, H200, H250, H300, H350, H400 INPSECT WIRES FOR KINKS OR RODENT DAMAGE. INSPECT TERMINALS FOR BREAKAGE OR CORROSION REMOVE WIRES AND MEASURE OHMS WITH PUMP ON; IF CLOSED – SWITCH IS OK. IF OPEN, RECONNECT WIRES & PROCEED.

How can I tell if my Hayward H400 is trouble?

Removing the top cover form the H400 to clean out leaves & small twigs that had accumulated I could see the heater core. I closed the circuit breaker to watch the ignition sequence through the heater core BEING CAREFUL NOT TO PUT MY FACE DIRECTLY OVER THE OPEN COVER, I could see the igniter glowing cherry red as it went through the 3 cycles.

What’s the difference between Jandy and Hayward pool heaters?

When it comes to troubleshooting Hayward pool heaters, there’s not too much difference between the problem solving process for other gas-fired heaters, made by Jandy, Pentair or Raypak. The components of a Hayward pool heater are also very similar to gas heaters made by other manufacturers.

Do you need a fireman’s switch on a Hayward gas heater?

ALL Hayward heaters have Fire Tile, which dissipates the heat immediately, so a fireman’s switch is not required. NOTE: Gas fired heaters should be diagnosed and repaired by trained personnel. What power supply do I need? Current year model electronic heaters are dual voltage and can operate on 120VAC OR 240VAC.

What does HS code mean on Hayward pool heater?

Has anyone had and experience with the HS code for Hayward heaters. Any ideas or advice will be appreciated. Thanks in advance. HS code is telling you that the water output temp is too high. The code does not necessarily mean the sensor is bad but, is instead telling you there is a problem in the operation of the heater.

How old is the Hayward H400 pool heater?

The pool is equipped with a Hayward H400 FDN gas heater. It is 4 years old. I was first getting a CE code. I replaced display board and it went away. Heater is firing up and after 1 minute of running it throws a HS Code and abruptly shuts off.

When to turn off water heater in Hayward pool?

It turned the heater on 30 minutes after the circulation pump went on and turned the heater off 30 minutes before the circulation pump went off. This was to allow the water to cool down and not damage the plumbing lines. ALL Hayward heaters have Fire Tile, which dissipates the heat immediately, so a fireman’s switch is not required.