Overheating (Navien)

Navien boiler water temperature exceeded the maximum safety limit, triggering emergency shutdown.

Common Causes

• Circulator pump failure
• Air trapped in system
• Flow switch or sensor failure
• System pressure too low
• Heat exchanger scaling or blockage

How ROMA Heating Fixes This

• Check circulator pump operation
• Purge air from boiler system
• Inspect flow sensor and temperature sensors
• Verify system pressure and add water if needed
• Flush heat exchanger if scaled