178 — Intervention of safety thermostat for excess temperature in low temperature system

What does 178 mean?

A safety thermostat has tripped due to excessively high temperature within the low temperature heating system circuit. This is a safety shutdown.

• Problem with pump operation or pump power input wiring
• Issues with water circulation in the low temperature system

Click steps to track your progress.

1. 1

   Press and hold down the Reset button for 2 seconds to try clearing the fault.

2. 2

   Ensure all valves in your low temperature heating system (e.g., underfloor heating) are fully open to allow proper circulation.

3. 3

   If the fault persists, contact an Authorised Service Centre to check the pump and system circulation.