Rinnai gas boilers, like a number of others, are prone to malfunctions. Therefore, manufacturers have provided a self-diagnosis system. In the event of a malfunction, a code is shown on the display that indicates the cause. In order for you to get rid of the problem faster, we will give all the errors of the Rinnay boiler, their decoding and solutions.
The device and features of the boiler
Japanese-made boilers “Rinnai” are closed-type appliances. These are turbocharged units in which a fan operates to force the removal of combustion products. The coaxial chimney supplies combustion air and removes smoke.
The ignition block is located in the center of the structure. The burner cuts the flame into three parts, so the heat exchanger warms up evenly. At the same time, the flame can be modulated in three modes. For example, in the summer you can turn on only one part, saving on fuel.
The product includes two copper heat exchangers: one for heating, the other for hot water supply (DHW). A three-way valve switches the heating from one system to another. Inside is an expansion tank of 8,5 liters.
Below is a circulation pump. Its rotor is dry, which contributes to the long-term operation of the assembly. It ensures the circulation of the coolant through the system. Remote control or keyboard. In the presence of a display that reflects the temperature and other indicators.
Fault codes
What should I do if an error appears on the display of the device? First of all, restart the boiler, a system failure may have occurred. If the characters do not disappear after the reboot, then proceed to troubleshooting.
| Error code | Value | How to fix the problem yourself |
| 7 | Prolonged use of hot water (more than 8 hours). | Check that the water valve and flow switch are working properly. Check for voltage at the CN 9 ends of the main module. |
| 11 | Ignition problems. There is no flame in the burner, or it is not recognized, it goes out immediately. | How to fix the situation:
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| 12 | The fire goes out after 20 ignition attempts. | Things to check:
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| 14 | Thermal fuse failure. | Inspect the terminals and wires of the fuse, check the sensor for a short circuit. Replace the control module. |
| 15 | The overheat sensor is out of order. The presence of a flame in the absence of water in the radiator. | Elimination:
Restart boiler. Try the water temperature when turning off and when turning on. |
| 16 | Water overheating. Sensor failure when determining a temperature of more than 95 degrees in three seconds. | Purge excess air from the system. Is the three-way valve, pump working properly. Clean the water filter or pipes. |
| 17 | Flow. The make-up alarm is triggered more than 64 times in 3 hours. | Inspect the nodes, pipes and connections at the time of the leak. Make sure air is being expelled from the system. |
| 18 | Grounding worked. The line voltage of the main unit has shifted by 5 watts. | Damaged wires, broken insulation. Needs replacement or repair. Voltage measurement between CN3 on the board and ground line. |
| 20 | Wrong position of the DIP switch. | Change location. |
| 28 | The remote control is defective. | Replace batteries. |
| 31 | Failure of the heating thermostat. | Test the thermistor for a short circuit. Install a new element. |
| 32 | Problems with the air thermistor. | Check the sensor contacts, replace the faulty wiring or the sensor itself. |
| 33 | Faulty direct water temperature thermistor. | |
| 34 | The DHW thermistor is damaged. | |
| 35 | Incorrect operation of the external thermistor. | |
| 36 | Low temperature thermostat malfunction. | |
| 43 | Low water level in the system. | Diagnostics of the level sensor for serviceability, make-up valve for serviceability. If everything is in order, add the required amount of water. |
| 52 | Proportional valve not working. | Measurement of voltage on the valve winding. |
| 56/71 | Problems with the electronic valve. | Diagnostics of the valve and water level sensor. |
| 59 | The device has overheated. | Replacing the fuse. |
| 61 | The fan motor is broken, or the rotation speed is not controlled. | Disassemble the device, and measure the voltage of the windings. A new fan is being installed. |
| 72 | The ionization sensor is out of order. The presence of a flame is fixed, although no fuel is supplied. | Inspection of the main unit. |
| 89 | The system has detected a complete freeze. | Check how air is supplied from the chimney, if the heat exchanger is clogged. Replace defective thermistor. |
| 90 | The fan test has not been carried out correctly. | Inspection and replacement of the fan. Cleaning the chimney, radiator from soot and dirt. |
| 96 | Problems with the first start of the DHW. | Make sure the water supply is normal. |
| 97 | Problems when starting the heating of a gas boiler. | |
| Error code 99 | Combustion products are poorly discharged. | Inspection of the tightness of the chimney, cleaning of blockages, repair of the fan. If you notice that the burner operation indicator flashes on the panel, it means that the hot and cold water taps are working. When the heating indicator blinks, it is necessary to clean the filter from clogging. |
Stopping boiler equipment in a cold winter is an unpleasant situation. The room is cooling down, people are freezing, equipment is also freezing. As a result, it may need to be completely replaced. Therefore, carry out preventive inspection of the boiler every year. Clean the nodes from scale and dirt. Install water filters to prevent blockages. They reduce the concentration of salts, so deposits do not accumulate on the walls of parts.
We hope that thanks to the recommendations you will cope with breakdowns and spend the winter in warmth and comfort.