Why Is the Heater not Getting Warm?
Why is the heater not getting warm? If your radiator isn´t heating up, several issues could be at play. How do you pinpoint the problem, and what can you do once you´ve found it? Let´s walk through the possibilities.
- Zoya Glushtrom
Table of Contents
Scenario 1: Only One Radiator Isn´t Heating
First, rake a walk around the rooms: Is just one radiator cold, or are multiple radiators affected?
Stuck Valve Pin:
If only one radiator is cold, the issue might be a stuck valve pin. To check this, turn the thermostat to the highest setting and remove the thermostat head by hand or with pliers. Look at the valve pin on the radiator. Is it sticking out or stuck? If it´s stuck, gently wiggle it with the pliers until it pops out. Your radiator should start heating up again.
Air in the Heating Pipes:
If your radiator is only partially warm or making bubbling noises, there might be too much air in the heating pipes. To release the air, you´ll need a radiator key (available at any hardware store).
Here´s how to bleed your radiator:
- Turn the thermostat all the way up.
- Place a container under the bleed valve.
- Use the key to open the valve until water starts to escape and the noise stops.
- Close the valve and adjust the thermostat to your desired setting.
Scenario 2: Several Radiators Are Not Heating Properly
If multiple radiators are not heating evenly, the issue could be low water pressure, an incorrect flow temperature, or an imbalance in the heating system (which may require hydraulic balancing).
Low Water Pressure:
When the water pressure in the heating system is too low, it can´t reach all the radiator, often leaving those on upper floors cold. Check the pressure gauge on your heating system; the ideal pressure is between 1.3 and 1.7 bar.
Incorrect Flow Temperature:
If the flow temperature is too low, the water isn´t getting hot enough to heat all your radiators. This can also cause your heating system to run inefficiently, raising your heating costs. A heating technician can adjust the system for optimal performance.
Hydraulic Imbalance:
If your heating system´s water flow isn´t balanced, not all radiators will receive the same amount of heat. A technician can perform hydraulic balancing to ensure efficient and even heating throughout you home.
Scenario 3: None of the Radiators Are Heating
If all your radiators are cold, the problem likely lies with the heat generator (like the boiler or heat pump). This could be due to external factors such as power supply issues or system malfunctions. If you suspect your heating system has failed, contact your landlord or property manager to have it inspected by a professional.
Faulty Heating Pump:
If the boiler is running but the pipes are cold, the heating pump may be broken. You can check this by holding the metal end of a screwdriver against the pump and listening for vibrations or water flow. If you don´t hear anything, the pump might need to be replaced.
Incorrect Settings:
Your system might still be set to summer mode, which turns off room heating. As a landlord, you can reset the system yourself or have it done professionally. Tenants should notify their landlord or property manager if they suspect this is the issue.
Supply Interruption:
If the heat generator isn´t working, consider these potential issues:
- Power Outage: Check the circuit breakers and restore power if needed.
- Fuel Supply: If you have an oil heating system, ensure there´s enough oil. For gas heating, verify that the gas valve is open, especially if there have been recent renovations where it might have been shut off (this should be handled by your landlord).
- Electronic Malfunctions: It there´s an issue with the system´s electronics, a code may appear on the display. Consult the user manual to identify the problem.
Summary: Possible Reasons for When the Heater Isn´t Warming Up
| One radiator is affected: possible cause | Possible solution |
|---|---|
| Vent pin is stuck | Remove the thermostat head and loosen the vent pin |
| Air in the radiator | Vent the radiator |
| Multiple radiators are affected: possible cause | Possible solution |
| Low water pressure | Refill the water |
| Incorrect flow temperature | Adjustment of flow temperature |
| Missing hydraulic balance | Hydraulic balancing |
| All radiators are affected: possible cause | Possible solution |
| External factors preventing operation | Ensure power and fuel supply, check the electronics |
| Incorrect presettings on the heat generator | Check and adjust presettings (e.g., “summer mode”) |
| Defective heating pump | Have pump replaced by a professional |
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