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Heating engineer · Brussels and Wallonia
Oertli error codes
The most common codes for Oertli oil boilers (OEcOil Condens and others), with what they mean and what to do.
H codes are a block: the boiler tries to restart on its own (except H07.01). E codes lock it out: it needs resetting.
Burner fault: no ignition spark or no flame. The boiler won't restart on its own.
Heating oilCheck there's still oil in the tank and that the supply valve is open. Reset the burner once: if it locks out again, don't keep trying; call us.
The flame is lost: the boiler locks out.
Heating oilCheck there's still oil in the tank and that the supply valve is open. Reset the burner once: if it locks out again, don't keep trying; call us.
The flame went out: the boiler is trying to restart.
TemporaryThe boiler restarts on its own once the cause is gone. If the code keeps coming back, call us for a check.
The flue pressure switch opened 5 times in 24 hours: the heat exchanger or burner needs checking.
Flue · safetySwitch the boiler off and air the room. This code concerns the flue: call us. If a CO alarm goes off, or anyone has a headache or nausea, get everyone outside and call 112.
The flue gases went above the maximum temperature 5 times in 24 hours.
Flue · safetySwitch the boiler off and air the room. This code concerns the flue: call us. If a CO alarm goes off, or anyone has a headache or nausea, get everyone outside and call 112.
Warning: the flue gases are too hot.
Flue · safetySwitch the boiler off and air the room. This code concerns the flue: call us. If a CO alarm goes off, or anyone has a headache or nausea, get everyone outside and call 112.
The return has been hotter than the flow for 5 minutes: the water circuit needs checking.
CirculationCheck the pressure and that the radiator valves are open. If everything looks fine and the code comes back, the water circulation needs checking (pump, bleeding, sensors): call us.
An external device (safety switch, thermostat…) is blocking the boiler.
TechnicianA component or electronics fault: this needs a technician. Don't open the boiler; call us and give the code shown.
The boiler flow sensor is open or short-circuited.
TechnicianA component or electronics fault: this needs a technician. Don't open the boiler; call us and give the code shown.
The hot water sensor is faulty or missing.
TechnicianA component or electronics fault: this needs a technician. Don't open the boiler; call us and give the code shown.
This code isn't in the list: call us and give it to us, we'll tell you straight away what's going on.
Source: Oertli, OEcOil Condens-2 FSC-2 installation and maintenance manual (7658541). Codes and how they're shown can differ between models: if in doubt, your appliance's manual applies.
First steps
- Write down the code shown: it saves us time.
- Check the pressure gauge.
- Check that the gas tap is open.
- Reset once. If the code comes back, call us.
Practical guides: Top up the pressure · Bleed a radiator · Reset the boiler
A breakdown, a question? Get in touch.
Call us or message us on WhatsApp. Or leave your number, with a photo of the boiler if you like: we'll call you back.
