E19
ACV
Modulation / Gas Valve Control Fault
Display shows E19, unit may not modulate correctly or may shut down under high demand
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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
Faulty gas valve modulation coil, Broken modulation control wire, Defective main control PCB output, Incorrect gas valve calibration
How to Fix / Troubleshooting
Safety: Gas modulation components must be serviced by qualified personnel only.
- 1. Visual inspection: With power off, inspect the modulation coil connector on the ACV gas valve. Ensure it is firmly seated and wiring is intact.
- 2. Reset unit: Power cycle and observe if the unit runs only at minimum or maximum power before faulting.
- 3. Professional checks: A technician should measure the modulation signal (voltage or current) from the PCB and compare to specifications, and verify gas pressures at different firing rates.
- 4. Replace faulty part: If the modulation coil is open circuit or the valve does not respond to control signals, replace the gas valve assembly with the correct ACV part.
Incorrect modulation can lead to poor efficiency and unsafe combustion; do not attempt DIY adjustments.
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Repair Difficulty
Professional Required
5/5
Required Part
Modulating Gas Valve
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