IVT DHW Performance / Heat Transfer Issue

Boiler runs but domestic hot water is lukewarm or fluctuates in temperature.

Advertisements

Safety Warning

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.

Advertisements

Possible Causes

Scaled plate heat exchanger, Faulty domestic hot water (DHW) NTC sensor, Partially blocked domestic hot water (DHW) inlet filter, Incorrect gas rate or burner output

How to Fix / Troubleshooting

Safety: Risk of scalding if temperature suddenly increases. Test water carefully.

Steps:

  • Check that the cold inlet isolation valve is fully open and that inlet filters are clean.
  • Reduce the domestic hot water (DHW) flow rate at the tap to allow more heating per litre.
  • A technician should inspect and descale or replace the plate heat exchanger and verify correct gas rate and combustion.
  • Test and replace the domestic hot water (DHW) NTC sensor if readings are unstable.
Advertisements

Repair Difficulty

Medium 3/5

Required Part

Plate Heat Exchanger
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements