hayward H200 Electronic Ignition


Old 08-09-08, 01:46 PM
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Join Date: Aug 2008
Posts: 1
hayward H200 Electronic Ignition

Unit will not fire error codes SF and HS

Help please
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Old 08-10-08, 06:00 AM
Join Date: Jul 2005
Location: New York
Posts: 723
The codes indicate that you may have bad thermistors or a blockage in the heat exchanger.

From the Hayward Manual:

Code SF: Thermistor error - An excessive temperature difference between the two thermistors (5 F or more) or an “out of bounds” condition on both sensors (less than 10F or greater than 180F) will result in the error code. Automatic restart is 2 minutes after the error is corrected.

Code HS: Excessive water temperature error - If water temperature exceeds 105F the heater will shut down and go into lockout. Automatic restart is 2 minutes after water temp. drops below 105F.

Being these two codes are related, I would first try to replace the thermistors. They are the thermostat sensors that go into the header of the heat exchanger

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