There are a number of reasons why a boiler circulator pump keeps running or is not working properly. This article will outline common causes and provide some troubleshooting tips to help you figure out what is causing the problem.

Should a circulating pump run all the time?

Ideally, a circulating pump should not run continuously. The pump’s purpose is to circulate hot water from the boiler through the heating system when it’s needed to maintain the desired temperature. If it runs constantly, it can lead to energy wastage and wear on the pump itself.

When a boiler is heating water, the circulating pump should run. It does this by pumping water from the bottom of your hot water tank to the top of your hot water tank. The circulating pump then stops when there is no more heat being added to your system. And all of that cold water at the bottom of your hot water tank has been moved up into another part of it where it can be used again later on when needed again.

How often should a boiler condensate pump run?

The condensate pump should run at least once every 24 hours. The frequency depends on the boiler’s operation and may vary based on the weather conditions and usage patterns. Continuous running of a condensate pump may indicate a problem with the boiler’s efficiency or drainage system.

It’s also worth noting that there are several different types of condensate pumps available for use in domestic heating systems. Each has its own recommended maintenance schedule based on how often it needs to operate in order to keep your system running smoothly.

Why does the pump on my boiler keep running?

Several factors can contribute to a boiler’s circulating pump running continuously:

  • Thermostat Issue: A malfunctioning thermostat could signal the boiler to run continuously, causing the pump to circulate water without shutting off.
  • Air Trapped in the System: Air pockets in the heating system can prevent proper water flow, making the pump run continuously in an attempt to overcome the blockage.
  • Failed Zone Valves: If your heating system has zone valves, a faulty valve can lead to continuous pump operation, as the valve fails to close properly.
  • Blocked Pipes or Radiators: Obstructed pipes or radiators can disrupt the flow of hot water, causing the pump to keep running in an effort to distribute heat evenly.

Why is my circulator pump running but with no heat?

If your boiler circulator pump is running but you’re not getting heat, there are several things to check. First, check the thermostat. If it’s set to “heat,” make sure that’s where it really should be. Next, check your boiler and make sure that it has sufficient fuel and water levels to produce heat. Finally, look at the pump itself. If there is any debris blocking its flow or something wrong with its internal workings (such as a worn bearing), then this could cause problems as well.

Why is my boiler and pump running when the timer is off?

If your boiler and pump continue running when the timer is off, it suggests an issue with the controls:

  • Faulty Timer or Thermostat: The timer or thermostat may be malfunctioning, erroneously signaling the boiler to operate.
  • Wiring Problems: Wiring issues within the control system can cause signals to be sent to the boiler and pump when they shouldn’t be.

How to fix the boiler circulating pump that keeps running?

To address a continuously running boiler pump, you should:

  1. Check the Thermostat: Verify if the thermostat is set correctly and functioning. Replace it if necessary.
  2. Bleed the System: Remove air from the heating system by bleeding radiators and ensuring proper water circulation.
  3. Inspect Zone Valves: Test zone valves for proper operation and replace any faulty ones.
  4. Clear Blockages: Check for and remove obstructions in pipes or radiators.
  5. Check Water Levels: Ensure the boiler has adequate water levels to prevent damage.
  6. Review Controls: Examine the timer, thermostat, and control wiring for faults, and replace or repair components as needed.


In conclusion, a continuously running boiler pump is a common issue with various potential causes. By following the steps outlined above and seeking professional assistance if necessary, you can identify and rectify the problem, ensuring your heating system operates efficiently and effectively.

About Dabonn

About Dabonn

Zhengzhou Dabonn Energy Co., Ltd.

We have more than 20 years of experience in boiler system equipment research and development and manufacturing. And committed to designing and producing boilers that suit your needs, including fire-tube, water-tube, and steam boilers, while also staying up-to-date with the latest technological boiler.

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