What's wrong with the wall-hung boiler not working? Full analysis of common causes and solutions
Recently, as the temperature drops sharply, the problem of wall-hung boilers not working has become a hot topic on the Internet. Many users reported on social platforms that the wall-mounted boilers in their homes suddenly stopped working, seriously affecting their heating in winter. This article will analyze high-frequency issues in the past 10 days through structured data and provide practical solutions.
1. Statistics on high-frequency wall-hung boiler failures across the entire network (last 10 days)
| Question type | frequency of occurrence | Main performance |
|---|---|---|
| Ignition failure | 38% | The display reports E1/E2 error code |
| Abnormal water pressure | 25% | The pressure gauge is lower than 0.8bar or higher than 2.5bar |
| Gas supply issues | 18% | Gas valve is not open/insufficient air pressure |
| Circulation pump failure | 12% | The water pump is stuck or the circuit is damaged |
| Motherboard failure | 7% | The display is unresponsive or garbled |
2. Detailed explanation of the five common fault causes
1. Ignition system failure
Nearly 40% of users reported ignition failure, usually accompanied by a "click-click" ignition sound but no flame. It is recommended to check: ① The distance between the ignition electrodes (should be 3-5mm) ② The carbon deposition on the electrodes ③ Whether the gas solenoid valve is energized.
2. Abnormal water pressure problem
Abnormal pressure values will cause safety lockout:
•Low pressure (<0.8bar): Fill the water through the water replenishing valve to 1-1.5bar
•High pressure (>2.5bar): Relieve pressure through drain valve or check expansion tank
3. Abnormal gas supply
Inspection process: Gas main valve → Gas meter balance → Pipe pressure (normal 2000-3000Pa). Pay special attention to the fact that freezing of liquefied gas cylinders in winter will cause insufficient air pressure.
4. Circulation pump stuck
The water pump is hot but has no running sound. You can try to tap the pump body with a screwdriver to remove the jam. If it doesn't work, you need to replace the water pump (professional operation).
5. Mainboard/sensor failure
When E5 (overheating protection), E9 (wind pressure failure) and other codes appear, focus on checking:
• Temperature sensor resistance (approximately 10kΩ at 25°C)
• Air pressure switch continuity
• Mainboard power supply voltage (220V±10%)
3. Emergency Steps Guide
| steps | Operation content | Things to note |
|---|---|---|
| first step | Check the power light | Make sure the socket has power and the fuse is intact |
| Step 2 | Check the pressure gauge value | It is necessary to start the wall-hung boiler when replenishing water |
| Step 3 | Listen to the ignition sound | No more than 3 consecutive ignitions |
| Step 4 | reset operation | Press and hold the reset button for 5 seconds |
| Step 5 | Preparation for repair report | Record fault codes and phenomena |
4. Preventive maintenance suggestions
According to feedback from heating engineers, 90% of failures can be avoided through regular maintenance:
•monthly: Check the pressure gauge and clean the filter
•every year: Professional cleaning of heat exchangers and testing of combustion efficiency
•every 3 years: Replace the circulating pump lubricant and detect circuit aging
5. Comparison of common fault codes of different brands
| brand | E1 | E2 | E5 |
|---|---|---|---|
| Power | Ignition failure | Wind pressure failure | Overheating protection |
| Bosch | Not enough gas | Water pump clogged | Temperature sensor failure |
| Rinnai | Electrode failure | Insufficient water pressure | Abnormal exhaust |
If the problem is not resolved after self-examination, it is recommended to contact the brand’s after-sales or professional maintenance personnel. According to data from the Consumer Association, disassembly and repair by non-professionals may cause secondary damage and increase the repair cost by 2-3 times.
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