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Potterton Boiler Fault Codes

Fault code Fault

E09

Gas valve connection cable fault

E10

External probe fault

E12

The differential water flow switch is still open

E13

The differential water flow switch is still closed

E15

Fault with the gas valve command

E20

Central heating negative temperature coefficient (NTC) fault

E28

Flue negative temperature coefficient (NTC) fault

E40

Central heating return negative temperature coefficient (NTC) fault

E50

Domestic hot water (DHW) negative temperature coefficient (NTC) sensor (tank boiler) (s.c) or DHW NTC sensor (tank boiler) (o.c.) Fault

E83 / E84 / E85 / E86 / E87

Communication error

E109

Pre-circulation fault

E110

Boiler Max temperature exceeded for gradient (or overtemperature) Probable pump jammed or air in the circuit or Safety thermostat sensor tripped

E118

Primary system water pressure too low

E125

Primary circulation fault

E128

Flame failure (12 times)

E129

Frequent loss of flame (safety error )

E130

Flue thermostat sensor tripped and locked out

E133

Possible gas supply issue (failure to light)

E134

Elapsed time gas valve open without gas

E135

Internal error (interruption of gas supply)

E154

Flow/return sensor temperature test

E160

Problem with fan (possible wiring fault)

E163

Domestic hot water (DHW) negative temperature coefficient (NTC) sensor fault (s.c.) or DHW NTC sensor fault (o.c.)

E270

Dry fire

E317

Wrong power supply (HZ)

E321

Hot water fault

E384

False flame

E385

Under voltage

E430

Water pressure test

E430 + Flame crossed

Water pressure test failed

What is NTC?


An NTC or ‘Negative Temperature Coefficient’ is a type of thermistor (or thermal resistor).

Basically, it’s an electrical component that helps to regulate the temperature of your boiler. So, when you set your heating to a certain temperature it will make sure your boiler stays at that temperature.

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Safety Warning

When your Potterton boiler error codes or fault lights flash, don’t do any repair work that involves working with gas as you are required to be Gas Safe Registered by law.

Here at Boiler Plan all our engineers are Gas Safe Registered and will do an amazing job with any Potterton boiler repair work you may need.

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