HEX: 17 - Gradient exceedance overheat protection

Fault Details:

The temperature rise at the heat exchanger has exceeded the upper limit.

Recommended Solution:

Check for fault in air intake/blow-out side on the heater unit, check for debris, damaged ducting, clogs, blockages, obstructions, check exhaust systems.

Note, different models and controllers might have different fault code meanings. If you're not sure, you can contact Heatso directly.