Drazice No Heat Transfer from Coil

Drazice combined heater coil does not heat the tank even though the boiler is running and hot.

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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.

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Possible Causes

Air lock in coil circuit, closed isolation valves, failed circulation pump, scaled internal coil, incorrect piping

How to Fix / Troubleshooting

Safety: Turn OFF power to the pump and boiler controls. Be cautious of hot water in the heating circuit.

Steps:

  • Check that all valves in the coil circuit (flow and return) are fully open.
  • Bleed air from the coil circuit using bleed valves on the Drazice heater and radiators if connected.
  • Verify that the circulation pump is running when there is a call for hot water; replace the pump if it is not operating.
  • If the coil remains ineffective, internal scaling may be severe; a professional may need to chemically descale the coil or, in extreme cases, replace the heater.
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Repair Difficulty

Hard 4/5

Required Part

Coil Circulation Pump
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