S.36 — No heating demand from low voltage controls

What does S.36 mean?

The boiler is not receiving a signal for heating from your low voltage external control system. This means the connection at terminals 7-8-9 is not active.

• Low voltage controls are off.
• Wiring issue at clamp 7-8-9.
• Low voltage control unit is not calling for heat.

Click steps to track your progress.

1. 1

   Check your low voltage external controls (e.g., programmer) and ensure they are set to call for heat.

2. 2

   Verify any low voltage control units are switched on and programmed correctly.

3. 3

   If the issue persists, contact a qualified service technician to check the wiring and control unit.