Control shows SUPPLY TEMP HIGH; boiler shuts down or modulates to protect system.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Failed circulator, Closed isolation valve, Air lock in piping, Misconfigured control setpoint

Safety: Hot water can cause burns. Let the system cool before touching piping.

1. Verify valves open: Ensure all main isolation valves around the boiler and circulators are open.
2. Check for air: Bleed air from high points and zone circuits using purge valves.
3. Confirm control settings: Check that the supply temperature setpoint on the Energy Kinetics control is within recommended limits.

If SUPPLY TEMP HIGH recurs, a technician should check flow rates and circulator performance.

Medium 3/5

System Circulator Pump

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