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Grundfos Central Heating Pump Being Very Hot [Troubleshooting]

A central heating pump is an integral part of many households. It is key to keeping the house warm during winter. Thus, it’s important to keep it in good condition. 

Quite often, people find their pump overheating. This is seen for the pumps that have been out for a long time.

How do you deal with a Grundfos central heating pump being very hot?

Your pump could be hot for a lot of reasons. Accumulation of too much dirt in the system is the most common reason. Also, some parts might get seized. They’re quite easy to fix. Some problems might even call for professional help or a full replacement of your system. 

In this article, we’re going to discuss the possible reasons behind your Grundfos pump overheating. We’ll also discuss how to fix them. Let’s begin!

Why Do Grundfos Central Heating Pumps Overheat? 

Your circulating pump carries hot water from one place to another. It’s very common for it to get warm or hot. The problem arises when it becomes too hot.

Generally, your pump should be hot to touch. If the heat gets too unbearable, you should look for possible causes and try to fix them. 

If your pump has been turned off for too long, it might get hot after turning it on. This is common when your pump has been off during summer.  

When the pump sits idle for too long, dust can accumulate or certain parts can get obstructed. This causes the Grundfos pump to overheat and make too much noise.

Here’s how to solve an overheating pump: 

Solving an Overheating Pump: 3 Easy Steps

An overheating pump can be troublesome. But dealing with the problem is fairly simple.

Step 1: Understanding The Problem

First, you have to understand what is causing your system to overheat. If it’s a seized component in the system, there will be a humming sound from the pump. Try to find any source of the sound.

Once you find the source, try lightly tapping on the noisy part a couple of times. This should free up the part and you’re good to go. 

If there’s no humming sound, you need to clean the system thoroughly. For that, follow the next step.

Step 2: Cleaning The System

It’s likely that the cause of your pumps overheating is the dirt in the system. You have to open the system and clean the dirt carefully. 

First, turn off the system and wait for a few minutes. Once it has turned off and cooled down, move to the next step.

We recommend having an idea about pumps  to help you out. Open the pump and clean the dirt thoroughly. The pump is free now, so there shouldn’t be any problem with overheating.

Step 3: Restart The Pump

Now that you’ve cleaned the pump, it’s time to turn it back on. All you have to do is just restart the pump and then wait for a few minutes. While it’s normal for the pump to heat up, it shouldn’t overheat. 

If the pump is still overheating, there might be some internal problem causing the heat. We recommend that you consult a mechanic immediately. It’s time for a repair or a replacement!

How to Maintain a Central Heating Pump?

While dealing with an overheating heating pump isn’t too big of a hassle. It’s always better to prevent such problems. For that, you need to know how to turn off your pump.

Some easy steps can help keep your pump in the best condition for quite long. Here’s what you need to follow-

Using a Filter 

A filter can be very useful to prevent dust accumulation inside your pump. It’s especially useful when you aren’t using the pump regularly.  

A good filter can prevent a fair bit of dirt from getting into your system. And prevent over clogging it. Clean the filter regularly and you can avoid a lot of problems for your circulating pump.

Keep the Vents Clean

The vents are an important part of your system. They keep the hot air outside and the air circulating. So, make sure to clean the vents regularly.

Also, dirty vents cause the system to work harder than normal.This puts a toll on your electric consumption.

Maintain the Water Level

The water level of your circulating pump is the most important part. If the pump is working without sufficient water, the pump will make excessive noise. Also, it could damage your pump beyond repair.

Make sure the water level is always consistent.

Lubricate Everything

Your pump has a lot of moving parts, so lubrication is an absolute necessity. It’s best to lubricate the pump once every few months for a smooth run.

Wondering which lubricant to use for your pump? Here’s our recommendation for some of the best:

Product 1
Product 2

These are two of the best lubricants available for your pumps. Give them a try if you like it.

Clean the boiler room

Generally, the circulating pump is kept in the boiler room. It’s important to keep the room clean and free from any sort of clutter. Clean your boiler room regularly to prevent any dirt and debris from accumulating.

And that’s a wrap! Follow these steps to deal with an overheating pump effortlessly!


Question: How to know if my pump is faulty without opening?
Answer: If the pump is overheating in certain parts, it might be a problem for the pump. Certain parts might be out of order causing it to overheat. In such cases, consult a mechanic immediately.

Question: What is the ideal setting for a Grundfos pump?
Answer: The ideal setting should be based on your needs. While we recommend keeping it at the highest. Although, you might need to reduce it in case it gets too hot or gets noisy.

Question: How much electricity does a pump use?
Answer: Although it depends on the size of the pump and the number of hours used. Generally, it will require 400 to 800 kWh if you keep the pump on for a full year.

Final Words

A Grundfos central heating pump being very hot could be a sign for a lot of underlying problems. You need to take steps to ensure it doesn’t get worse.

In this article, we’ve discussed the steps to help you deal with an overheating pump. 

We hope you find this article helpful!