BoilerFaultCodes.com

Glow-worm 30ci 30si 35ci Fault Codes

Combi Natural GasLPG 30-35 kW 2003-2007 Discontinued
GC Numbers: 47-019-0347-019-0447-019-05

Replaced by: Flexicom cx

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

0.5bar
Your boiler has stopped working because the water pressure has dropped too low to operate safely.
May be DIY safe · £0-120
01
Your boiler has tried to ignite but failed, likely because gas isn't reaching the burner or the flame isn't being detected.
May be DIY safe · £90-280
02
Your boiler has stopped working because it cannot safely vent waste gases or confirm that the internal fan is running correctly.
Gas Safe engineer required · £120-280

All 36 fault codes

Code Severity Plain English
0.5bar High Your boiler has stopped working because the water pressure has dropped too low to operate safely.
01 High Your boiler has tried to ignite but failed, likely because gas isn't reaching the burner or the flame isn't being detected.
02 High Your boiler has stopped working because it cannot safely vent waste gases or confirm that the internal fan is running correctly.
2.7bar Emergency Your boiler has too much water inside it, which has caused the pressure to rise to a level where the system may shut down or leak to protect itself.
05 High Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
06 High Your boiler has detected a problem with the sensor that monitors the temperature of the water leaving the unit to heat your radiators.
09 High Your boiler has lost track of the system's water pressure because the internal sensor is failing or disconnected, causing the unit to shut down for safety.
11 High Your boiler has stopped working because the internal control panel cannot talk to the main computer brain of the unit.
12 High Your boiler is having trouble communicating with its control screen or your thermostat, which is preventing it from receiving your heating instructions.
13 High Your boiler's internal computer has encountered a critical error and can no longer communicate with the rest of the system.
14 High Your boiler has shut down because the water inside it has become too hot, triggered by a safety sensor to prevent damage.
15 High Your boiler is unable to control the flow of gas correctly to create a flame, meaning your heating and hot water will not work.
16 High Your boiler has detected an issue with the internal valve that controls the flow of gas, causing the system to shut down for safety purposes.
17 High Your boiler is not receiving enough electrical power from your home's mains supply to operate safely.
18 High Your boiler's main control panel has lost communication with the internal system, meaning your settings or commands aren't being processed correctly.
19 High Your boiler has stopped working because a sensor that monitors the temperature of the water in your heating system has become loose or disconnected from its pipe.
20 High Your boiler's main control panel is failing to communicate with the internal system because they are not compatible or there is a software mismatch.
F01 High Your boiler is failing to light the gas to create a flame, meaning you have no heating or hot water.
F1 High Your boiler is failing to detect a flame after it tries to start, meaning your heating and hot water will not work.
F02 High Your boiler has stopped working because it cannot safely expel waste gases or verify that the internal fan is moving air correctly.
F04 High Your boiler started to light but the flame went out unexpectedly while it was running, causing the system to shut down for safety.
F4 High Your boiler is successfully igniting, but it cannot detect the flame and shuts down immediately for safety.
F05 High Your boiler has switched itself off because it has gotten too hot, likely due to a circulation issue or a component failure.
F06 High Your boiler has detected a problem with the sensor that monitors the temperature of the water leaving the unit to heat your radiators.
F07 Medium Your boiler's hot water sensor has developed a fault, meaning it cannot accurately measure the temperature of the water coming out of your taps.
F08 High Your boiler has detected a sensor error that prevents it from accurately measuring the temperature of the water returning from your radiators.
F09 High Your boiler has lost track of the system's water pressure because the internal sensor is either faulty or disconnected, causing the heating to stop working for safety.
F11 High Your boiler's main control board and the display panel are having trouble talking to each other, which has caused the system to stop working.
F12 High Your boiler’s internal control screen and main computer board have lost connection with each other, preventing the boiler from functioning.
F13 High Your boiler's main internal computer has developed a memory or communication error and can no longer control the heating system safely.
F14 High Your boiler is struggling to control the amount of gas it uses, which prevents it from heating up correctly.
F15 High Your boiler is having trouble switching between heating your radiators and providing hot water because a mechanical motor inside has stuck or failed.
F16 High Gas valve / Ionisation fault
F17 High Your boiler is not receiving enough electrical power from your home's supply to operate correctly.
F19 High Your boiler has detected that a temperature sensor has become loose or disconnected, preventing it from reading how hot the water is.
F20 High Your boiler's internal computer parts are having trouble communicating with each other or have been replaced with mismatched versions.

Glow-worm 30ci 30si 35ci is discontinued — time for a new one?

Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.

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