157 Fault Alarm – DHW Recirc. Pump / Zone Circuit Pump Output Issue

What does 157 mean?

The boiler's programming unit display may show a general "Fault message" or a specific code like 157. Code 157 indicates a problem related to the domestic hot water (DHW) recirculation pump or a zone circuit pump output, suggesting a pump malfunction or an electrical issue with its connection.

• Malfunction of the DHW recirculation pump
• Issue with a zone circuit pump
• Wiring error for the pump output
• Control unit fault related to pump control

Click steps to track your progress.

1. 1

   Check the boiler's display for any additional detailed messages accompanying the fault code.

2. 2

   Press the Reset button on the boiler's programming unit to attempt to clear the fault.

3. 3

   If safe and accessible, visually inspect the DHW recirculation pump and any zone circuit pumps for power or signs of malfunction.

4. 4

   Verify that the electrical connections to the DHW recirculation pump or zone circuit pump are secure and undamaged.

5. 5

   If the fault persists, contact a qualified technician to diagnose the pump or wiring.