Vokera Return Sensor Out of Range / Calibration Error

Display shows 24, furnace may lock out or modulate incorrectly

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.

Possible Causes

Incorrect return sensor, Poor contact with pipe, Scale or sludge on pipe, PCB fault

Safety: Isolate power before working on sensors.

Confirm sensor specification: Check that the return NTC matches the Vokera part number for this furnace.
Improve contact: If the sensor is strapped to the pipe, ensure it is tight and insulated from ambient air with insulation wrap.
Clean pipe surface: Remove rust or paint under the sensor contact area to improve thermal transfer.
Test operation: Reset the unit and observe. Persistent faults require PCB evaluation by a technician.

Medium 3/5

Return NTC Temperature Sensor

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