To Next PageTo Next PageWhat does error code A1 mean on a Hayward HDF400 Gas Heater?
If your Hayward Gas Heater shows the 'A1' error code, this indicates the switch circuit never closed when the blower turned on, or it re-opened within 10 seconds of the blower starting.
What does error code A3 mean on my Hayward Gas Heater?
If the Hayward Gas Heater displays error code 'A3', it indicates the switch opened after the heating cycle was completed but before the post-purge time could be completed.
What does error b4 mean on a Hayward HDF400?
If your Hayward Gas Heater displays error code 'b4', the ignition control board will lockout until the error condition is corrected.
Why won't the blower start on my Hayward HDF400 Gas Heater?
The ignition control board on your Hayward Gas Heater will not start the blower until the circuit is opened.
General| Model | HDF400 |
|---|---|
| Category | Gas Heater |
| BTU Input | 400, 000 BTU |
| Fuel Type | Natural Gas or Propane |
| Heat Exchanger | Cupro-Nickel |
| Efficiency | 84% |
| Ignition System | Electronic |
| Warranty | 1 year |
Specifies required clearances from combustible materials and for service access.
Step-by-step guide for replacing the natural gas mixer with an LP mixer.
How to select desired temperature and modes (Standby, Pool, Spa) using the digital thermostat.
Explanation of user interface elements and input procedures for the control panel.
Description of the heater's ignition sequence and normal heating cycle operation.
Describes the retry sequence for ignition attempts and lockout conditions.
Explains the heater's response and retry sequence when flame is lost.
Procedures for leak testing the gas supply line and connections using a soap solution.
Explains gas pressure requirements and conditions for proper burner operation.
Step-by-step guide for measuring and adjusting gas inlet and manifold pressures.
Importance of proper water chemistry to prevent heat exchanger damage.
Instructions for replacing the fuel/air mixer for gas conversion or maintenance.
