Mizudo Gas Boiler Error Codes Anarchy reigns in the principles of coding boiler errors – each manufacturer sets its own rules for encrypting error codes. For coding errors, it is usually accepted to use a combination of letters of the Latin alphabet and numbers from 0 to 9. Often, to interpret a particular code, it is enough to resort to the help of the technical documentation of the product. As a rule, it contains tables with the name of the fault, the cause of the fault and a list of measures taken to eliminate it .
Mizudo Boiler Error Code Solutions
Mizudo Boiler Error Code E1
It indicates a malfunction of the ignition system. Fault notification comes from the flame control sensor. This part takes into account the presence of a flame and stops the working functions of the Mizudo boiler during limited combustion of the main burner or in case of difficulties with gas supply. Blocking occurs after three unsuccessful starts. Press and hold the R button to resume workflow.
Gas valve failure – The gas valve is electronically controlled. Diagnostics of this component is carried out by measuring voltage and resistance. If it is found that the values differ from the standard characteristics, the valve must be replaced. There is no gas supply to the system – There is a valve in the gas distribution system that closes the flow of gas fuel. That’s why, failure to start the unit may occur due to a closed valve. Weak contact or no signal from the ionization flame sensor. Malfunction of the electronic control board – When the ignition has occurred correctly, but the unit suddenly fades out, it is likely that the electronics do not detect the flame. Therefore, you need to check it.
Mizudo Boiler Error Code E2 (E8)
Overheating of the Mizudo boiler heat exchanger. The device is blocked. The overheating thermostat has tripped – The overheating thermostat, as well as the temperature sensor, are most often located on the outlet pipe of the main heat exchanger. The main purpose of the thermostat is to protect the apparatus from excessive temperature rise. An accident can appear due to problems in the thermostat, temperature sensor, as well as in case of a malfunction in the main circulation circuit.
Temperature sensor problems – The control board receives an incorrect signal or the contact between the sensor and the electronic board is broken. Faulty superheat thermostat – If the thermostat is OK, although there is an actual superheat of the liquid, then there seems to be a problem with the circulation of the coolant in the main circuit. The primary heat exchanger or the filter element of the heating circuit is clogged (low circulation level implies increased heating of the liquid). The circulation pump is damaged or an air blockage has formed in the heating system.
Mizudo Boiler Error Code E4
Indicates low pressure in the system. The main factors in which this problem occurs: low coolant pressure in the heating circuit. Contact failure between the pressure sensor and the electronic board. Pressure switch failure. The first step is to look at the results of the pressure gauge. As a rule, the problem is eliminated with the help of a feed valve, which is installed to fill the system with coolant. When the failure repeats again, then most likely there is a water leak. A hydraulic pump, a primary heat exchanger, a safety valve, worn seal elements, a feed valve and other parts can leak. A leak can be identified during the inspection of waterworks and components.
Mizudo Boiler Error Code E3
There is no traction. For the correct and safe operation of the device, it is necessary to create a draft for the removal of exhaust gases so that they do not enter the living quarters. The exhaust of gases is controlled by electronics, and when any malfunctions occur, the thrust sensor-relay is activated, and the device stops working. The main sources of lack of traction: the narrowed size of the discharge channel, a flaw in installation, clogging with dirt, ice on the walls. Reducing the diameter of the chimney leads to weak draft.
The length of the chimney pipe is exceeded It is necessary to carefully read the instructions for using the gas appliance and follow all the necessary requirements. An excessively long straight section of the chimney pipe causes a weakening of the necessary draft. Draft sensor malfunction – If a vacuum occurs in the inlet tube, you can hear a characteristic click. There is no contact between the traction sensor and the electronic board, there is condensate, as well as incorrect connection of the tubes to the pressure switch. There are problems with the fan – The fan impeller is clogged. There is no lubrication on the fan shaft, and therefore it has low speed. The contact between the fan and the board that controls the electronics is broken.
Mizudo Boiler Error Code E6
The hot water temperature sensor is not working properly. This circumstance means that the DHW temperature sensor is damaged or the allowable temperature is too high. Probable causes influencing the formation of this malfunction: the temperature sensor for hot water supply is defective. Contact failure between the DHW temperature sensor and the electronic board. Control board failure. When the DHW temperature sensor is in good condition and firmly connected to the electronic board, although the unit displays an error, then, apparently, the electronic board needs to be replaced.
Mizudo Boiler Error Code E5
Ignition problems. This code is issued when there is no ignition or burner flame failure is observed. It is required to check the contacts between the ignition device and the flame electrode, and also between the electronic board and the gas valve. One of the factors in the attenuation of the flame of the burner is insufficient draft.
Mizudo Boiler Error Code E7
The heating circuit temperature sensor is not working correctly. This means that the heating system temperature sensor is damaged or the operating temperature has risen. An open in the heating circuit temperature sensor circuit – This malfunction may occur if there is no connection between the temperature sensor and the electronic board, or the temperature is much lower than required. Within 5 seconds following the detection of an accident, the Mizudo device will resume correct operation, in case the malfunction occurred spontaneously. It is necessary to check that there is no moisture on the sensor connector and the control board connector.
If there is no moisture, the temperature sensor must be replaced. The occurrence of a short circuit of the heating circuit temperature sensor – This malfunction may occur after a short circuit of the temperature sensor contacts or the temperature value of the water is above normal. You should first measure the resistance of the temperature sensor. If the resistance characteristics are not as required, the sensor must be replaced. If installing a good sensor does not give the desired result, replace the control board.
The Mizudo boiler is in operation. In the last week, it almost constantly starts to issue an error code E1. After rebooting with the reset key, the boiler sometimes turns on without problems, but this happens very rarely. The other day I removed the air intake plug and it worked better. What is the fault?
When it knocks out a smoke exhaust error, you should open the protection covers. This will help draw air out of the room. Then inspect the chimney for the presence of ice and, if necessary, clean it. If the failure is associated with flame separation, you need to find out if gas is supplied to the house.
Often, an error with code E7 is on the boiler. Help me figure out what it means?
This code refers to a problem with the heating system temperature sensor. It looks like it needs to be changed.
What is the problem if the Mizudo boiler does not turn on? And still constantly starts to issue an error E2. What to do?
This failure usually appears due to some problems with the thermostat, temperature sensor, and besides this, in case of malfunctions in the operation of the main circulation circuit. Perhaps there is overheating of the liquid in the heat exchanger. If the thermostat and temperature sensor are OK, then the problem is with the control board. It needs to be replaced.
Why does the unit not start and error code E4 is issued? Holds pressure well, no leaks. I try to disconnect from the mains, but the problem is not removed. What’s the matter?
The fault code usually appears when the fluid pressure in the heating circuit is reduced. With such a malfunction, it is necessary to check the water level sensor. Apparently, the problem is in it.
The malfunction of the device is as follows: hot water supply is set to a temperature of 45 degrees. When hot water is turned on, the burner starts to burn and then goes out. This cycle happens frequently. From the mixer flows either cold water or warm (not hot). Periodically produces an error E8. Why is this happening?
This circumstance indicates that the coolant has overheated in the hot water circuit. Apparently, there was a blockage of the heat exchanger, or the thermostat has incorrect adjustments.
There was such a problem. During ignition, the device goes into error E5. When we reboot, it turns on, but the gas burner only lights up, a few clicks occur, and the error is displayed again. I replaced the ionization electrode, flushed the flow sensor, removed the earth from the plug, but there were no improvements. What happened?
This problem occurs for three reasons. Damage to the flame control electrode. The gas supply is incorrect. The electronics board is failing.
The boiler autonomously interrupted the operation and the code E4 is issued. How to be?
Low level of coolant in the unit or failure of the pressure sensor. First fill the system with coolant.
The gas boiler turns off with an error code signal E3. Blowing and cleaning helped for a short time. What to do?
This situation signals insufficient traction and the exhaust system must be checked. It is possible that the membrane is stuck. Otherwise, it is necessary to contact a specialist for a detailed check of the boiler and further it.
The Mizudo boiler works at home. Error E6 began to be issued. The unit itself functions, the temperature of the liquid is regulated by a manual switch. During its installation, it seems to have overheated, since the keep warm mode was turned on. We did not install an external air temperature sensor. What is causing this malfunction?
We assume that there was a breakdown of the hot water temperature sensor. Sometimes the electronic board is damaged.
The device performs work for about four to five minutes, then the gas burner goes out, and an error occurs with code E3. It glows for about a minute, the burner turns on again, and the device functions normally for another 5-6 minutes, and so on in a circle. This failure, judging by the instructions, means that the draft sensor has worked, but the chimney channel is not clogged, the combustion products are discharged normally. Can anyone explain what is causing the problem?
In a particular case, the main reasons preceding the lack of traction are: problems with the pneumatic traction sensor. Disruption of contact between the traction sensor relay and the electronic board. There is condensate, as well as poor connection of the tubes to the pressure switch. There was a problem with the fan. Most likely, it operates at low torque.