E19
IBC
Primary Pump / Flow Fault
Boiler shows E19; may indicate pump or flow-related fault on the primary circuit.
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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
Failed internal boiler pump, Airlock in primary loop, Blocked primary filter or strainer, Incorrect pump wiring
How to Fix / Troubleshooting
Safety: Turn off power and allow the boiler to cool before touching piping.
- Check pump operation: During a call for heat, place a hand on the primary pump body. You should feel vibration and slight warmth. If silent and cold, it may not be running.
- Bleed air: Use any built-in air vents or bleed screws near the pump to release trapped air.
- Inspect isolation valves: Ensure valves on either side of the pump are open.
- Check wiring: With power off, verify the pump harness is connected securely to the control board or pump relay.
If E19 persists, the pump may need replacement or the control output may be faulty. A technician should measure pump current draw and verify flow.
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Repair Difficulty
Medium
3/5
Required Part
Primary Circulation Pump
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