E6
Peerless
Supply Temperature Sensor Fault
Boiler control shows E6 and shuts down; may be intermittent
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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
Open or shorted supply temperature sensor, damaged sensor wiring, failed control input
How to Fix / Troubleshooting
Safety first: Turn off power before accessing the control compartment.
Steps:
- Locate the sensor: Find the supply water temperature sensor on the outlet piping or heat exchanger of the Peerless boiler. It is usually a small probe or thermistor with two wires.
- Inspect wiring: Check for broken insulation, loose connectors, or corrosion at the sensor and at the control board terminals.
- Check resistance: With power off, disconnect the sensor and measure its resistance with a multimeter. Compare to Peerless temperature/resistance chart (e.g., at 77°F an NTC sensor may be ~10kΩ). If reading is open or shorted, replace the sensor.
- Reconnect and reset: After repair, reconnect the sensor, restore power, and reset the boiler.
- If E6 persists: The control board sensor input may be defective and require replacement by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Supply temperature sensor
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