Heatline Solaris 30PC Fault codes & diagnostics

12 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas
GC Number 47-157-05
Download the Heatline Solaris 30PC manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

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9 High 3 Low

All 12 documented codes

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CC

Your boiler has detected an issue with one of its temperature sensors, but it should still be able to keep working while you arrange for a professional to take a look.

Low Engineer only £90-180

Parts commonly replaced

  • External temperature sensor
  • Flue sensor
  • Wiring harness
F0

Your boiler has detected that the water pressure inside the system is outside of the safe operating range, so it has shut down to prevent damage.

High DIY-safe £80-150

What to check first

  1. Locate the filling loop (a silver flexible hose with one or two valves) underneath the boiler.
  2. Gradually open the valve(s) to let water in until the pressure gauge on the front panel reads between 1.0 and 1.5 bar.
  3. Tighten the valves firmly and check to ensure the pressure remains stable.

Parts commonly replaced

  • Filling loop
  • Pressure sensor
  • Expansion vessel

Related codes

F1

Your boiler has automatically shut down for safety because its internal temperature has climbed too high.

High Engineer only £120-250

Parts commonly replaced

  • NTC sensor
  • Primary heat exchanger
  • Pump
  • Overheat thermostat

Related codes

F2

Your boiler is struggling to accurately detect the temperature of your hot water, which means it has stopped heating it up to prevent the system from getting too hot.

High Engineer only £120-220

Parts commonly replaced

  • DHW NTC sensor

Related codes

F3

Your boiler has stopped working because it is unable to accurately measure the temperature of the water inside the system.

High Engineer only £120-220

Parts commonly replaced

  • NTC Temperature Sensor
  • Wiring harness

Related codes

F4

Your boiler is failing to light the flame needed to produce heat or hot water.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB

Related codes

F5

Your boiler has detected a fault with a safety sensor that monitors the temperature of the gases leaving your flue, meaning the boiler has shut down to prevent potential overheating.

High Engineer only £150-250

Parts commonly replaced

  • Flue gas temperature sensor
  • Wiring harness

Related codes

F6

Your boiler is having trouble reading the outdoor temperature because the sensor outside your home or its wiring has been damaged.

Low Engineer only £90-150

Parts commonly replaced

  • External temperature sensor
  • Sensor wiring

Related codes

F7

Your boiler is struggling to confirm that the internal fan is spinning correctly, so it has safely shut itself down to prevent any unsafe operation.

High Engineer only £150-250

Parts commonly replaced

  • Fan assembly
  • Wiring harness
  • Printed Circuit Board (PCB)

Related codes

F8

Your boiler has detected that the air circulation system is not operating at the correct speed, so it has safely shut itself down to prevent unsafe operation.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Air pressure switch
  • Venturi
  • Printed circuit board

Related codes

F9

Your boiler has detected that the internal exhaust fan is spinning when it should be turned off, which is a safety fault that prevents the boiler from starting up.

High Engineer only £150-250

Parts commonly replaced

  • Fan assembly
  • Printed Circuit Board (PCB)

Related codes

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