A8 362 — Low mains voltage or invalid HCM

What does A8 362 mean?

This code indicates either low or inconsistent mains voltage, or an invalid Heat Control Module (HCM). The boiler's electrical supply or its internal control unit may have a problem.

• Interrupted or inconsistent mains voltage.
• Defective Heat Control Module (HCM).
• Incorrectly inserted or incompatible HCM.

Click steps to track your progress.

1. 1

   Check your home's electrical supply for any power fluctuations or outages.

2. 2

   Reset the boiler by turning it off at the mains for 30 seconds and then back on.

3. 3

   If the problem persists, contact a qualified electrician or Gas Safe engineer to check the mains voltage and the HCM.