H91 — Tank heater OLP abnormality

What does H91 mean?

The Overload Protector (OLP) for the tank heater has detected an issue, indicating either a disconnection or activation due to an overload. This error triggers if the abnormality continues for 60 seconds.

• Tank heater OLP is disconnected.
• Tank heater OLP has activated due to an overload.

Click steps to track your progress.

1. 1

   Turn off the power supply to the unit at the main breaker and wait at least 5 minutes to allow the system to cool down and reset.

2. 2

   Check your home's electrical panel for any tripped circuit breakers specifically labeled for the hot water tank heating system.

3. 3

   If the error persists, contact a qualified technician to inspect the tank heater and its OLP.