Elecro
No Heat Output with Active Control
Heater display is on but elements never energize; no heat is produced.
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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 power contactor not closing, Failed output relay on Elecro control PCB, Open-circuit heating elements, Safety interlock (flow/high limit) not closing fully
How to Fix / Troubleshooting
Safety first: High voltage is present at the contactor and elements. Only qualified persons should test live circuits.
- Confirm demand: Ensure the thermostat is set above current water temperature and that the heater indicates a call for heat.
- Listen for contactor: When heat is demanded, listen for a click from the contactor. No click suggests a control or coil issue.
- Check coil voltage (professional): With the unit calling for heat, measure voltage at the contactor coil. If present but contacts do not close, replace the contactor.
- Test elements: With power off, test each element for continuity. Replace any open elements.
- Verify safety chain: Confirm flow switch and high limit are closed using a multimeter.
Replace the faulty contactor, elements, or PCB relay as required.
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Repair Difficulty
Hard
4/5
Required Part
Elecro Power Contactor / Output Relay / Titanium Heating Elements
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