Pahlen
Insufficient Flow Through Heat Exchanger
Pahlén pool pump is installed with a Pahlén heat exchanger and flow through the heater is insufficient
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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
Bypass valve incorrectly set, Undersized pump speed on variable-speed Pahlén pump, Clogged heat exchanger tubes, Air trapped in heater circuit
How to Fix / Troubleshooting
Safety first: Turn off pump and heater before adjusting valves. Hot water and surfaces can cause burns.
- Set bypass correctly: Adjust the bypass valve so that adequate flow passes through the Pahlén heat exchanger according to installation guidelines.
- Increase pump speed: On variable-speed models, raise the speed during heating cycles to meet the minimum flow requirement.
- Bleed air: Open any air vents on the heat exchanger to remove trapped air.
- Clean exchanger: If flow remains low, have the heat exchanger inspected and cleaned for scale or debris.
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Repair Difficulty
Medium
3/5
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