Tuya Power Supply Instability or Electrical Noise

Thermostat randomly resets or reboots, especially when relay switches on/off

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 terminals, Voltage dips when load switches, Inductive load (pump, fan) causing spikes, Inadequate internal power filtering on Tuya PCB

Safety first: Turn off power before tightening terminals or adding components.

Steps to troubleshoot:

Inspect and tighten all power and load terminals on the thermostat to ensure solid connections.
If controlling an inductive load (pump, fan, contactor), install a suitable snubber or RC network across the load or use a contactor with built-in suppression.
Verify that the supply voltage is within the thermostat’s specified range and not dropping excessively under load.
If resets persist, replace the thermostat; internal capacitors or regulators may be failing.

Hard 4/5

Internal Power Supply / Voltage Regulator (Tuya Thermostat)

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