Do you use a Celtic gas boiler? Then you probably appreciated its effectiveness and adaptability to operating conditions. Sometimes codes appear on the display of the device. They can indicate both the current mode of operation and a breakdown in the system. Please refer to the manual for the exact value. Decryption of errors and troubleshooting methods are described in detail in our article.
The principle of operation of Celtic boilers
The double-circuit device “Celtic” is capable of heating an area of up to 350 m². If you connect several boilers according to the cascade principle, then there are more rooms.
The heat exchanger for the heating system is made of copper. The secondary lamellar radiator is made of stainless steel. Thanks to this, the equipment is distinguished by reliability and durability. Closed combustion chambers are equipped with fans with automatic speed control. The node responds to changes in the system and reduces or increases the speed.
The circulation pump is equipped with protection against blockages and jamming. It works stably when water pressure drops to 0,15 bar and gas pressure drops to 0,01 bar. The security system includes control sensors. There is a built-in voltage regulator.
Management – electronic and remote using the remote control. The unit works almost silently, the noise level does not exceed 37 dB.
Errors and malfunctions
It happens like this: a minute ago, the Celtic boiler was regularly heating the water, when suddenly the work stopped, and a fault code appeared on the scoreboard. See below for a breakdown of the codes to know how to eliminate the cause of the failure.
| Error code | Which means | How to fix the problem |
| A1 | Communication failure between the remote control and the electronic board. | Check connections, pins between control board and interface board. |
| A2 | The fan has failed. | Diagnostics of the fan, its motor, wiring. Replacement of failed parts. |
| A3 | The circulation pump is not working. | Inspect his impeller for blockage, unlock the work. Install the correct item. |
| A4 | The safety thermostat has tripped. The temperature in the circuit exceeded 110 degrees. | There may not be enough air in the expansion tank. To download, turn off the equipment and drain the water. Then start the pump. Wait until the pressure rises to 1 atm.
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| A5 | There is not enough fluid in the system. | Make sure there are no leaks in the pipes, connections. Inspect the boiler components, as well as the three-way valve. If everything is in order, increase the pressure in the circuit to 1 atm. Turn on the drink. |
| A6 | Fuel supply problems. Too little or too much pressure in the line. There is no gas supply. | What to do:
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| A7 | The gas valve is out of order. | Inspect cables and connectors. Switch the valve off and on again. If a part is defective, replace it. |
| AA | The coolant temperature sensor has tripped. Overheated over 95 degrees. | Checking the sensor for serviceability. Removing scale from the heat exchanger with reagents. Turn on the power supply. |
Other problems
There are also such malfunctions in the operation of the Celtic boiler:
- The device does not heat water over 60 degrees. It is necessary to clean the filters and the gas reducer;
- When turned on, the device makes a lot of noise, the AC code may be displayed. Add air to the system, make sure that there are no foreign objects in the pump blades. Descale the radiator. Also check the temperature sensor connections, the condition of the cables;
- If the boiler makes noise when taking in cold water and error A5 is generated, then add coolant to the circuit.
Now you know how to deal with problems without calling the wizard. But sometimes you still need the help of a specialist. For example, when replacing the control board, you cannot do without it. Be attentive to your technique, then you will be able to avoid serious damage.