E16
Heatrae Sadia Auxiliary Pump / Fan Control Fault (where applicable)

Heatrae Sadia digital water heater shows E16 and will not start; fan or pump (if fitted) does not run.

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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 pump or fan motor, Seized pump, Faulty relay on PCB, Wiring fault to auxiliary device

How to Fix / Troubleshooting

Safety first: Isolate power. Moving parts can start unexpectedly when power is restored.

Steps to address E16:

  • 1. Identify auxiliary device: Some Heatrae Sadia systems use a small circulation pump or fan. Locate this component.
  • 2. Check for mechanical seizure: Attempt to rotate the pump or fan impeller by hand (with power off). If seized, replacement is usually required.
  • 3. Electrical checks: Inspect wiring from the PCB to the pump/fan. Look for loose connectors or burnt terminals.
  • 4. Test supply (for competent persons): With appropriate safety measures, verify that the PCB is sending power to the device when a demand is present. If power is present but the device does not run, replace the device. If no power is present, the PCB relay may be faulty.
  • 5. Professional repair: Due to live mains wiring, replacement of pumps, fans, or PCB relays should be carried out by a qualified engineer.
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Repair Difficulty

Professional Required 5/5

Required Part

Circulation Pump or Fan Assembly
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