Potterton Gold Combi ErP Fault codes & diagnostics

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

Combi Natural GasLPG 2015 onwards
GC Numbers 47-393-4347-393-4447-393-4547-393-46
Download the Potterton Gold Combi ErP manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Severity at a glance

Each cell = one fault code. Hover to identify.
9 High 1 Medium
Versions & GC numbers

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
47-393-43 Gold 24 Combi ErP 2015–present
47-393-44 Gold 28 Combi ErP 2015–present
47-393-45 GOLD 28 LPG COMBI ErP 2015–present
47-393-46 Gold 33 Combi ErP 2015–present
Just want the most common Potterton Gold Combi ErP faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 10 documented codes

Tap any card for details

E20

Your boiler's internal thermometer for the heating system has stopped working, so the unit has shut down for safety because it cannot track water temperature.

High Engineer only £90-160

Parts commonly replaced

  • Central Heating NTC Temperature Sensor
  • Wiring harness connectors

Related codes

Full explanation for E20
E28

Your boiler has detected a problem with the sensor that monitors the temperature of the exhaust gases, causing the system to shut down for safety.

High Engineer only £120-£200

Parts commonly replaced

  • Flue NTC Sensor
  • Wiring harness
  • Main PCB

Related codes

Full explanation for E28
E50

Your boiler is having trouble measuring the temperature of your hot water, which means your taps and showers may not get warm.

Medium Engineer only £90-£160

Parts commonly replaced

  • DHW Temperature Sensor (NTC thermistor)
  • Connecting wiring harness

Related codes

Full explanation for E50
E110

Your boiler has switched itself off because it has detected that it is getting too hot inside.

High DIY-safe £100-280

What to check first

  1. Turn the selector switch to the reset position for five seconds and then back to 'On'.
  2. Check that all radiator valves are open and not blocked by furniture.
  3. Ensure your system pressure is between 1 and 1.5 bar on the pressure gauge.

Parts commonly replaced

  • Overheat Thermostat
  • Circulating Pump
  • Temperature Sensor (NTC)

Related codes

Full explanation for E110
E119

Your boiler has detected that the water pressure is too low for it to operate safely and has shut down as a result.

High DIY-safe £0-160

What to check first

  1. Check the pressure gauge on the front of the boiler; it should ideally be between 1 and 1.5 bar.
  2. Locate the filling loop (usually two silver braided hoses under the boiler) and open the valves until the gauge reaches the green section.
  3. Ensure the valves are closed tightly and reset the boiler using the control knob.

Parts commonly replaced

  • Filling loop
  • Water pressure switch
  • Expansion vessel

Related codes

Full explanation for E119
E125

Your boiler is struggling to move heated water through the system, often caused by a blockage or a pump issue.

High DIY-safe £180-450

What to check first

  1. Check that your radiator valves and isolation valves are fully open
  2. Bleed your radiators to remove any trapped air pockets
  3. Gently restart the boiler using the reset button

Parts commonly replaced

  • Circulation Pump
  • Plate Heat Exchanger
  • Flow Temperature Sensor

Related codes

Full explanation for E125
E130

Your boiler has shut down because a sensor has detected that the exhaust gases are getting too hot, which is a safety feature to prevent damage.

High Engineer only £120-£280

Parts commonly replaced

  • Flue NTC Sensor
  • Main Heat Exchanger
  • Fan

Related codes

Full explanation for E130
E133

Your boiler has failed to light because it either cannot get enough gas or cannot detect the flame properly.

High DIY-safe £100-280

What to check first

  1. Check if other gas appliances in your home, like a hob, are working correctly
  2. Ensure your gas meter has credit if you have a prepayment meter
  3. Check that the white condensate pipe outside hasn't frozen in cold weather
  4. Press and hold the reset button for five seconds

Parts commonly replaced

  • Gas Valve
  • Ignition Electrode
  • Flame Sensing Electrode
  • PCB

Related codes

Full explanation for E133
E160

Your boiler has detected a problem with the fan that clears exhaust gases, preventing it from starting up for safety reasons.

High Engineer only £220-£450

Parts commonly replaced

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

Related codes

Full explanation for E160
E193

Your boiler is failing to circulate water correctly before it starts up, which is preventing it from heating your home or water.

High Engineer only £150-300

Parts commonly replaced

  • Circulation pump
  • Pressure sensor
  • Wiring harness

Related codes

Full explanation for E193
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