Glow-worm Intermittent Power / Memory Retention Issue

Thermostat randomly resets to factory settings, losing schedules

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.

Possible Causes

Loose power connection at backplate, Intermittent 24 V transformer, Failing internal memory, Frequent manual power cycling

How to Fix / Troubleshooting

Safety: Isolate mains power before checking wiring to backplates or transformers.

Steps:

Check that the thermostat is firmly seated on its backplate and that the spring contacts are not bent or corroded.
Inspect the wiring to any external transformer or wiring center supplying the thermostat. Tighten loose terminals.
Avoid switching the boiler/thermostat power off at the mains every night; use the thermostat's own scheduling instead.
Update firmware if available to address any known memory bugs.

Remedy:

If resets continue despite stable power, the internal memory or power conditioning is defective. Replace the thermostat head.

Repair Difficulty

Medium 3/5

Required Part

Glow-worm smart thermostat main PCB

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