To Next Page
R
Ryan BrownSep 13, 2025
What to do if my Hayward H250FDP displays 'Blower Vacuum Switch closed'?
What to do if my Hayward H250FDP displays 'Blower Vacuum Switch closed'?
Overview of the troubleshooting guide for Universal H Series Heaters.
Essential safety guidelines and warnings for operating the heater.
Diagram and identification of components on the Integrated Control Board.
Layout and function of fuses on the circuit board for older and newer models.
Description of normal and failure-to-light operating sequences.
Details on electrical and gas connection points for the heater.
Instructions for programming heater bypass and temperature lock-out modes.
Procedure for testing and adjusting gas pressure for proper operation.
List of diagnostic codes and corresponding replacement part numbers.
Troubleshooting steps for when the heater fails to power on.
Diagnostic steps for open fuses FC1, FC2, FC3, and FC4.
Troubleshooting guides for various Service LED error codes (BD, EE, CE, etc.).
Details on required water flow rates and heat exchanger inspection procedures.
Common causes of heat exchanger failure, including water chemistry and flow issues.
General
