What does error code E52 mean on a Google Nest thermostat?

Overcurrent on HVAC wiring. The thermostat detected an overcurrent error on your HVAC equipment.

Can I fix Google Nest code E52 myself?

Start with these safe checks: With power off, check that no bare wire ends are touching each other. Overcurrent points to wiring or equipment problems. Have an HVAC pro check it.

When should I call a technician for code E52?

Overcurrent points to wiring or equipment problems. Have an HVAC pro check it. Thermostat wiring is low voltage, but switch the HVAC system off at its breaker or service switch before pulling the thermostat off the wall. If the code points to the furnace or outdoor unit, leave gas, combustion and refrigerant parts to a licensed HVAC technician.

Google Nest Thermostat Error Code E52 / E53 / E54: Overcurrent on…

What E52 means

The thermostat detected an overcurrent error on your HVAC equipment.

Also shown as: E53, E54, E55, E56, E57, E58, E102, E103, E104, E105, E106, E107, E108, E182, E183, E188, depending on the model.

Likely causes

Wiring short
HVAC equipment fault

Safe first checks

With power off, check that no bare wire ends are touching each other.

When to stop

Overcurrent points to wiring or equipment problems. Have an HVAC pro check it.

Checked against: Google Nest Help: Troubleshoot Nest thermostat help codes. Codes can differ by model and year, so confirm with your owner's manual.