E19
Heatmiser
Zone Mapping / Addressing Error
Thermostat shows E19 and cannot control hot water or secondary zone via wiring centre
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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
Duplicate thermostat addresses on bus, Incorrect zone assignment in wiring centre, Misconfigured DIP switches, Firmware bug in zone controller
How to Fix / Troubleshooting
Safety first: Isolate power to the wiring centre and thermostats before adjusting DIP switches or bus wiring.
Steps:
- Check the address or zone number set on each thermostat (via installer menu) and ensure each is unique.
- On the Heatmiser wiring centre (e.g., UH8), verify that thermostats are connected to the correct zone inputs and that any DIP switches for zone type (heating/hot water) are set correctly.
- Clear and reconfigure zone assignments in the NeoHub or app if used.
- Power cycle the entire system after changes and confirm that E19 has cleared and each zone responds correctly.
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Repair Difficulty
Medium
3/5
Required Part
Heatmiser Wiring Centre (e.g., UH8)
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