Control shows PLATE HX TEMP ERROR; boiler may shut down during domestic hot water production.

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

Scaled plate heat exchanger, Failed plate HX sensor, Restricted flow on boiler or domestic side

Safety: Hot water and surfaces can burn. Allow system to cool and shut off power before servicing.

1. Check domestic flow: Verify that domestic water flow is adequate and that inlet strainers are not clogged.
2. Inspect sensor wiring: Locate the plate heat exchanger temperature sensor and ensure its wiring is intact and connected to the control.

Descaling or replacing the plate heat exchanger is a professional task that involves isolating and flushing the component.

Professional Required 5/5

Plate Heat Exchanger

Check Price on Amazon

We may earn a commission from links on this page.