Mysa Power Supply Instability / Brownout

Thermostat randomly resets or reboots, especially when the heater turns on.

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 line or neutral connection, Voltage sag when heater engages, Failing internal power supply capacitors

Safety first: Turn OFF the breaker and verify power is off before tightening any connections.

Steps to check:

Tighten terminals: Remove the thermostat and ensure all LINE, LOAD, and NEUTRAL (if used) terminals are tight.
Inspect wiring: Look for burnt or discolored insulation indicating overheating.
Check circuit loading: Ensure the circuit is not overloaded with multiple high-wattage devices.

If reboots continue after correcting wiring and load issues, the internal power supply is likely failing. Replace the thermostat.

Hard 4/5

Internal Switched-Mode Power Supply (SMPS)

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