What to do if the cast iron radiator is not hot? Summary of popular solutions across the network in the past 10 days
As the temperature drops sharply in winter, the problem of radiators not being hot has become a hot topic on the Internet recently. The following is an analysis of the causes and solutions that have received the most attention from netizens in the past 10 days. We provide you with structured solutions based on professional advice and user testing experience.
1. Common reasons and proportions of cast iron radiators not getting hot
| Reason | Proportion | Typical performance |
|---|---|---|
| Air blockage (internal air is not exhausted) | 45% | The upper part is not hot, the lower part is warm |
| Pipe blockage (scale or impurities) | 30% | The overall temperature is uneven and the sound of water flow is abnormal |
| The valve is not fully open | 15% | Single radiator is not hot |
| Insufficient system pressure | 10% | Multiple sets of radiators are not hot at the same time |
2. Step-by-step solution
Step 1: Troubleshoot air blockage
① Locate the air release valve (usually screw-shaped) on the top of the radiator.
② Use the screwdriver to slowly turn it counterclockwise and stop when you hear a "hissing" sound.
③ Close the valve immediately after the water flow stabilizes. Note: A container is required to catch the drained water.
Step 2: Check Valve Status
① Confirm that the main entrance valve and the radiator sub-valve are both open (the valve handle is parallel to the pipe).
② If it is a temperature control valve, check whether it has been adjusted to the lowest setting by mistake.
Step 3: Clean the filter
① Close the water inlet valve and return valve.
② Use a wrench to remove the Y-type filter and clean the internal filter.
③ After reinstalling, slowly open the valve and observe the water flow.
3. Professional-level processing suggestions
| Question type | Tool preparation | Operational risk warning |
|---|---|---|
| Severe limescale blockage | Professional descaler, pulse cleaning machine | The entire heating system needs to be shut down |
| Pipe welding repair | Welding gun, sealant | Must be operated by certified personnel |
4. Tips that netizens have recently tested and found to be effective
1.Vibration method: Tap the radiator pipe lightly with a rubber mallet to help loosen deposits (for older cast iron radiators).
2.Thermometry: Turn off other radiators first, and circulate hot water to flush the target radiator.
3.Magnet adsorption: Install a strong magnet at the return pipe to absorb rust and impurities (needs to be cleaned regularly).
5. Maintenance cost reference
| Services | average market price | Suggestions |
|---|---|---|
| Door exhaust | 50-80 yuan | Can be operated by yourself |
| System cleaning | 200-400 yuan/group | It is recommended to clean if it has not been cleaned for more than 5 years. |
Things to note:
1. Be sure to close the main valve of the heating system before operation.
2. If the above methods are still ineffective, the main pipe pressure may be insufficient and you need to contact the heating company.
3. When the cast iron radiator is heated for the first time, it takes a long time to heat up (about 2-3 hours), which is normal.
Through the above structured solutions, more than 90% of the problems of radiator not heating can be solved by themselves. If you encounter complex situations, it is recommended to make an appointment for door-to-door testing services through professional platforms such as "Heating Doctor".
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