H9
AstralPool
Internal Control Board Fault
Heater displays H9 and will not fire; may occur after a power surge or lightning event.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Damaged main PCB from surge, Corrupted firmware, Shorted low-voltage component, Moisture on control board
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before touching the control board.
- Power cycle: Leave the heater powered off for at least 5 minutes, then restore power to see if the code clears.
- Inspect control compartment: Remove the front panel and check for signs of water ingress, insect nests, or burnt components on the PCB.
- Check all low-voltage connections: Ensure all harnesses are fully seated and that no wires are shorting against the chassis.
If H9 persists, the main control board will likely need replacement. This should be performed by an authorized AstralPool service technician.
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Repair Difficulty
Professional Required
5/5
Required Part
AstralPool Main Control Board
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