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Ann WalkerSep 12, 2025
What to do if my Hayward H350FDP Heater displays 'Blower Vacuum Switch closed'?
- CChristopher StuartSep 13, 2025
If your Hayward Heater displays 'Blower Vacuum Switch closed', check the blower vacuum switch for issues.
To Next PageTo Next PageWhat to do if my Hayward H350FDP Heater displays 'Blower Vacuum Switch closed'?
If your Hayward Heater displays 'Blower Vacuum Switch closed', check the blower vacuum switch for issues.
General| Model | H350FDP |
|---|---|
| Category | Heater |
| Heating Capacity | 350, 000 BTU |
| Fuel Type | Natural Gas or Propane |
| Thermostat | Electronic |
| Weight | 150 lbs |
| Efficiency | 80% |
| BTU Input | 350, 000 BTU |
| Heat Exchanger Material | Cupro-Nickel |
| Warranty | 1 Year |
| Ignition Type | Direct Spark |
| Water Flow Rate | 30-120 GPM |
Warning about fire or explosion if instructions are not followed, causing property damage, injury, or death.
Instructions for responding to gas leaks, emphasizing safety precautions and immediate actions.
Key safety guidelines for installation, operation, and maintenance of the heater.
Details on risks associated with suction outlets, including types of entrapment and prevention measures.
Overview of the manual's content and recommendation to read it before use.
Brief overview of the heater's limited warranty terms and coverage.
Guidelines for balancing pool/spa water chemistry to protect the heat exchanger.
Importance of maintaining adequate water flow for heater operation and protection.
Detailed table of recommended chemical levels and their effects.
Requirements for installing a chlorinator downstream of the heater with a check valve.
Procedure for using a bypass valve during initial balancing and for service.
Instructions for starting, stopping, and operating the heater.
Critical safety warnings and procedures to follow before attempting to light the appliance.
Step-by-step guide for starting and operating the heater safely.
Explanation of STANDBY, SPA, and POOL modes for temperature control.
Procedure to change the temperature display between Fahrenheit and Celsius.
Guidelines for protecting the heater from freezing temperatures during cold spells.
Steps for safely starting the heater after winterization, recommending professional consultation.
Table listing error codes, their descriptions, and information for troubleshooting.
Details on what the limited warranty covers, including defects and leaks.
Explains limitations on implied warranties and liability for damages.
Lists specific conditions and exceptions that void the warranty.
Instructions for initiating a warranty claim, including contact information.
Manufacturer's liability limits and safety warnings regarding materials near the heater.
