Potterton Boiler E09 Fault Code


The Potterton fault code E09 gas valve cable loose operation Q & A or require an engineer for an emergency boiler repair.


The Potterton Boiler Fault Code E09 Error Common Q & A


Just below, we have a list of common questions relating to the E09 fault code on the Potterton boiler.

Potterton Boiler E09 Fault Code

  • What does the E09 fault code mean on my Potterton boiler?
  • If my boiler is showing the E09 fault code, does that mean it’s dangerous?
  • Can I reset my boiler to clear the E09 fault code?
  • What are the issues that lead to the E09 fault code being displayed?
  • How would water damage occur on my Potterton boiler?
  • Can my boiler engineer check to see if the heat exchanger has a leak, and can it be fixed?
  • How will my repair engineer know if it’s the pump that is leaking?
  • If the connection cable isn’t loose on the gas valve, what’s the probable cause of the E09 fault code being displayed?
  • My boiler repair specialist thinks the gas valve needs replacing, how much will this cost?
  • How can my Potterton boiler’s PCB cause problems that lead to the E09 fault code being displayed?

What does the E09 fault code mean on my Potterton boiler


Potterton boilers have a range of fault codes that are displayed when there’s an issue with the appliance. These fault codes are designed to give an indication of what the problem is, to your heating engineer. This makes the fault-finding process is much quicker, and therefore, much cheaper.

If your Potterton boiler is showing the E09 fault code, it’s because the gas valve connection cable is loose, damaged, or not connected.

If my boiler is showing the E09 fault code, does that mean it’s dangerous


The fault code system on boilers isn’t just to help Gas Safe engineers to find and fix the problem; they also make sure your boiler is safe.

When fault codes are displayed, your boiler should lock out. In it’s locked out state, it’s rare that a boiler is going to be dangerous.

The lock out is there to stop boiler components getting damaged, and to protect people living in your property from danger. In this case, the fault relates to the gas valve. Continued operation could lead the boiler to be dangerous.

Can I reset my boiler to clear the E09 fault code


The reset shouldn’t do anything in this case. Your boiler should instantly lock out again after each reset. That’s because a reset is only designed to be used when a boiler problem has been fixed; it’s not a fix.

However, a reset could temporarily trick the boiler into thinking that the fault has been fixed. This could lead to the boiler working for a few minutes in a dangerous state. So, don’t reset your boiler if a fault code is being displayed, especially when it relates to a problem with gas.

Instead, you need to call an emergency boiler repair specialist. It’s only Gas Safe registered professionals that are legally allowed to work on boilers, so you should call one to work on your appliance.

Once they’ve fixed the fault, they’ll be able to reset your boiler for you.

What are the issues that lead to the E09 fault code being displayed


There are a few explanations when it comes to what could be causing the E09 fault code to be displayed. Typically, we find that the fault is due to:

  • Water damage
  • Boiler vibrations
  • Faulty gas valve
  • Faulty printed circuit board (PCB)

How would water damage occur on my Potterton boiler


Water damage is a common killer of modern boilers. There are certain parts that are prone to degrading, and when they do, they can leak. The leaks from these parts can find there way onto electrical components, wiring and connections. And, when this happens, it can cause a whole host of problems.

Most leaks come from either the heat exchanger, or the boiler’s pump.

Can my boiler engineer check to see if the heat exchanger has a leak, and can it be fixed


Boiler leaks are usually obvious; you’ll see pooling below the boiler. However, if the leak is small, you might not see water beneath the boiler.

A quick visual inspection of the heat exchanger will show your boiler repair engineer whether the heat exchanger is leaking.

If it is, it’s likely that it’s cracked due to limescale build-up and old age. Unfortunately, it’s rare that a heat exchanger can be repaired. Instead, it needs to be replaced, and this can cost as much as £500.

How will my repair engineer know if it’s the pump that is leaking


Like the heat exchanger, a leak coming from the pump is usually obvious. It’s most likely that the seals on the pump are weeping. This could be down to old age and the seals degrading, or the fact that the pressure in the boiler is too high and it’s blown the seals.

If your pump is still in good condition (besides the seals), it can be repaired at a cost of around £100. However, if the pump is particularly old and worn, it makes sense to invest in a new one. A new pump replacement will usually cost in the region of £250.

If the connection cable isn’t loose on the gas valve, what’s the probable cause of the E09 fault code being displayed


Your boiler service engineer will be able to check that the connection cable to the gas valve is secure. And if it is, they’ll want to check it for power using a multi-meter. Whereby the cable is failing, a replacement will be needed.

But, if the cable checks out OK, the gas valve needs to be tested. Fault code systems aren’t an exact science, and sometimes they don’t highlight the exact problem.

In this case, it might be an intermittent signal being provided by the gas valve to the PCB. Like the connection cable, the gas valve needs to be tested using a multi-meter. And, if the valve is getting power, your engineer will need to check that it’s not sticking.

A sticking gas valve will be providing too much/not enough gas to the burner. This is dangerous, so the boiler is likely to lock out.

My boiler repair specialist thinks the gas valve needs replacing, how much will this cost


The gas valve isn’t a cheap part to replace. You should expect the cost to be in the region of £300. The exact cost of replacing a Potterton gas valve will depend on the model of your boiler.

When spending substantial amounts of cash like this on boiler repairs, it’s worth consulting your engineer. Do they think the other parts on your boiler are in good condition?

Parts like the PCB, fan and pump are all expensive to replace. If you’re likely to need one or more of these parts soon, as well as a new gas valve, it may be worth getting some quotes for a new Potterton boiler.

A new Potterton boiler will be covered on warranty. And, that means avoiding expensive repair bills like this one.

How can my Potterton boiler’s PCB cause problems that lead to the E09 fault code being displayed

It’s the printed circuit board that controls all the electronic parts on your Potterton boiler. When a PCB malfunctions, it starts to give and receive the wrong signals. In fact, it can even start displaying fault codes for problems that don’t exist.

If your boiler engineer suspects a problem with the PCB, they can test the wiring, connections and the PCB itself, using a multi-meter. If they find it’s the PCB that’s failing and it needs replacing, it’s likely to cost in the region of £500 to fix.

Other Potterton boiler issues


For more boiler issues regarding the Potterton Boiler then please visit the Potterton Boiler Problems And Cures page.