Fondital Heating Demand Not Recognized

Water heater does not respond to room thermostat, heats only when hot water is used.

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

Incorrect wiring of room thermostat, Faulty diverter valve stuck in DHW position, Control parameters misconfigured

Safety: Turn off power before altering control wiring.

Check thermostat wiring: Verify that the room thermostat is wired to the correct terminals on the Fondital control strip.
Thermostat function: Test the thermostat by bridging its terminals; if the heater starts, the thermostat is faulty.
Diverter valve: If DHW works but heating does not, the diverter valve may be stuck and should be inspected and replaced if necessary.
Parameter check: A technician can access installer settings to ensure heating mode is enabled.

Medium 3/5

Diverter Valve Assembly

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