Thermex Gas Boiler Error Codes All your boiler’s fault codes will be listed in your installation and servicing manual which is in place for guidance when an engineer is carrying out diagnostics but can be useful to the user to know what’s wrong to pass this info on when booking a visit.
Once you’ve established which fault error is relevant, you will need to refer to your boiler’s manual or visit the manufacturer’s website. Both will be useful resources for helping you to work out what the code is as well as provide helpful tips on how to fix it.
Thermex Boiler Error Code Solutions
Thermex Boiler Error Code E06 (E08)
It means that the ignition is blocked. The ionization flame sensor that monitors the ignition reports a malfunction. This part detects the presence of a flame and stops the operation of the Thermex boiler in case of insufficient combustion of the main burner or in case of problems with gas supply. The operating mode is terminated after 3 unsuccessful starts. To return to work, you need to keep the Reset button pressed. Faulty gas valve – The gas valve is controlled by an electronic board.
This component is tested by measuring resistance and voltage. If the readings do not correspond to the nominal parameters, the valve must be replaced. Lack of gas supply to the unit – A valve is installed in the gas distribution device that closes the gas supply. Consequently, a malfunction at the time of starting the boiler may occur due to a blocked tap. Weak contact or no pulse detected from the ionization flame sensor. Electronic board defective – If the ignition process goes smoothly, but the unit goes out immediately anyway, then the control board may not detect the flame. In this case, it is recommended to check it.
Thermex Boiler Error Code E07
The problem with overheating of the heat exchanger of the Termex boiler. The device stops. The overheat protection thermostat is triggered – The temperature sensor and the overheat thermostat are most often located on the outlet pipe of the main heat exchanger. The functional task of the thermostat is to protect the apparatus from an excessive increase in temperature.
The accident most often occurs due to problems with the thermostat, temperature sensor, and in addition, when the operation of the main circulation circuit is difficult. Faulty temperature sensor – The electronic board receives an incorrect signal or poor contact between the sensor and the electronic board. Faulty overheat thermostat – If the sensor is suitable for operation, but a real overheating of the coolant is detected, then most likely there is a problem with the circulation of the coolant in the main circuit. The primary heat exchanger or the filter of the heating circuit is clogged (low circulation level causes increased heating of the liquid). A malfunction with the circulation pump or an air blockage has formed in the heating system.
Thermex Boiler Error Code E02 (E9)
Speaks of insufficient pressure inside the system. Possible reasons why this malfunction appears: a decrease in water pressure in the heating system. There is no contact between the pressure switch and the control board. Malfunction of the minimum pressure switch. First you need to check the results of the pressure gauge. As a rule, the problem is eliminated by using a make-up valve that is installed to fill the system with coolant. If the emergency appears again, then most likely there is a fluid leak. The hydraulic pump, primary heat exchanger, relief valve, worn gaskets, make-up valve and other components can leak. Leakage can be found during an external inspection of the hydraulic components.
Thermex Boiler Error Code E13 (E14)
No traction. For the stable and safe operation of the Thermex gas boiler, it is necessary to create a draft to remove flue gases so that they do not enter the living quarters. This is followed by automation, and if some problems arise, the draft sensor turns on, and the gas appliance stops working. Possible sources of lack of draft: limited size of the chimney, design mismatch, clogging with dirt, icing of the inner wall. Reducing the diameter of the flue duct can cause a lack of draft. The chimney pipe is too long Read the instruction manual for the gas boiler carefully and comply with the relevant requirements. A very long horizontal outlet of the chimney leads to a weakening of the required draft.
The pressure switch – draft sensor is damaged – When a vacuum occurs in the supply pipe, a soft click will be heard. Lack of contact between the electronic board and the pressure switch-draft sensor, the presence of condensate, as well as improper connection of the tubes to the pressure switch. Fan defective – The fan impeller is clogged. There is no lubrication on the fan shaft, which is why it has low speed. There is no contact between the fan and the board that controls the electronics.
Thermex Boiler Error Code E04
The temperature sensor for hot water does not work correctly. This code means that the DHW temperature sensor is damaged or the recommended temperature has increased significantly. Possible sources of this problem: the DHW temperature sensor is broken. There is no contact between the DHW temperature sensor and the electronic board. Control board failure. If the DHW temperature sensor is operational and correctly connected to the electronic board, but at this moment the device detects an error, then most likely the control board is not operational.
Thermex Boiler Error Code E41
Ignition problems. This circumstance occurs if the ignition does not work or the burner flameout is observed. It is necessary to inspect the connections between the ignition unit and the flame sensor, and also between the board and the gas valve. The main reason for the attenuation of the burner flame is weak draft.
Thermex Boiler Error Code E05
The heating system temperature sensor is not working properly. This situation indicates a malfunction of the temperature sensor in the heating system or the recommended temperature has been exceeded. The heating circuit temperature sensor circuit is damaged – This malfunction most often occurs when there is no contact between the temperature sensor and the control board, or the temperature is below the recommended value. Five seconds after the failure is detected, the Thermex boiler will restore normal operation, in case the malfunction occurred spontaneously.
It is required to check that there is no moisture on the sensor connector and the control board connector. If there is no moisture, the temperature sensor needs to be replaced. The appearance of a short circuit in the temperature sensor of the heating system – This situation can occur when the temperature sensor circuit is short-circuited or the temperature value of the water is higher than recommended. First you need to measure the resistance of the temperature sensor. If the resistance parameters do not match the required ones, it is recommended to replace the temperature sensor. When replacing the temperature sensor does not bring the desired result, change the controller.