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Biasi Boiler ER07 Fault Code

The Biasi fault code ER07 related to the domestic hot water heating probe which we include Q & A or require an engineer for an emergency boiler repair.


The Biasi Fault Code ER07 Error Common Q & A

Just below, we have a list of common questions relating to the ER07 fault code on the Biasi Boiler.

Biasi Boiler ER07 Fault Code Error
  • What does the ER07 fault code mean on my Biasi boiler?
  • Why does my boiler lockout after showing the ER07 fault code?
  • Can I fix the ER07 fault code myself?
  • Where will my heating engineer start, to try and fix the problem?
  • If the temperature probe is OK, what else could be the problem?
  • How will my boiler engineer know what’s wrong with the PCB?
  • What else could be wrong with the PCB, and how much will it cost to fix?
  • Could anything else be causing the ER07 fault code to be displayed?
  • If heating sludge and limescale are a problem, can they be removed?

What does the ER07 fault code mean on my Biasi boiler

If your boiler is showing the ER07 fault code on the display panel, it means there’s a problem with the domestic hot water heating probe. This probe is going to be feeding back signals to the printed circuit board (PCB), to ensure that the boiler is working correctly. When the PCB notices that the readings being given are incorrect, it’s going to lockout.

Why does my boiler lockout after showing the ER07 fault code

There’s a chance that continued operation could cause further damage to certain parts in your boiler. To stop this from happening, your boiler is going to lockout; it will stop working until the problem is found and fixed.

But, that’s not the only reason a boiler locks out. On some occasions, continued operation could mean that the boiler is dangerous.

Can I fix the ER07 fault code myself

There are some fault codes whereby the fix is extremely simple. Unfortunately, the ER07 fault code on Biasi boilers isn’t one of them. In order to fix the problem, the boiler’s casing will need to be removed, and that’s going to be classed as working on a gas appliance. The only people that are legally allowed to work on gas appliances are Gas Safe registered engineers.

So, you need to contact an emergency Gas Safe company. They’ll be able to determine what the problem is. Once fixed, they’ll reset your boiler which will clear the ER07 fault code from the display panel and get the boiler up and running again.

Where will my heating engineer start, to try and fix the problem

The first place to start, is the domestic hot water temperature probe. The PCB is relying on the readings from this probe, to ensure that the boiler is working within tolerance. So, whether the problem is the probe being completely faulty, or something minor like a loose connection, the PCB is going to recognise the problem.

To determine whether the domestic hot water temperature probe is the problem, your boiler engineer will need to use a multi-meter. Using the multi-meter, they can test all wires, connections and the temperature probe.

For loose connections, simply securing the connections will fix the problem. However, if the temperature probe is damaged and isn’t passing on the correct information to the PCB, it’s going to need to be replaced before the ER07 fault code can be cleared from the display panel.

If the temperature probe is OK, what else could be the problem

Whereby the temperature probe isn’t the issue, the next step is to check the electronics. Your boiler repair company is likely to focus on the PCB.

The PCB is one of the most important parts on your boiler. It doesn’t just monitor readings from sensors like the temperature probe, it gives commands to other important parts like the gas valve.

So, if your PCB is faulty, there’s a chance that this is the issue, not the temperature probe. It’s likely that the PCB is the problem if you’ve noticed your boiler acting sporadically lately, as well as not responding to commands from the display panel buttons and dials.

How will my boiler engineer know what’s wrong with the PCB

The first thing your boiler company will need to do, is a quick visual inspection; this will highlight any obvious issues like water damage, or loose connections. In the case of loose connections, securing these connections is likely to fix the problem.

However, water damage is another story. There’s a good chance that if water damage is present, it’s due to a leaking pump. It’s important to fix the root cause of the leak, before fixing the PCB. Not only will the leak cause further damage to the PCB, it’s likely to disrupt other electrical components as well.

If the pump is the cause, it’s likely the seals need replacing. These can be picked up from local plumbing merchants. However, if the pump is beyond repair, a replacement will be needed. Typically, we’d expect a replacement to cost around £250 including parts and labour and take around one day to fit.

What else could be wrong with the PCB, and how much will it cost to fix

Whether it’s water damage or old age, it may be that your PCB needs replacing. Your boiler repair engineer will check this, using a multi-meter.

Could anything else be causing the ER07 fault code to be displayed

If the temperature probe isn’t the issue, your boiler repair company is likely to investigate everything that helps circulate water around your boiler. A lack of circulation could mean water overheating, and that’s going to trigger the domestic hot water temperature probe to kick into action.

As an example, the pump could be blocked full of heating sludge, which is going to reduce its ability to circulate. Likewise, the heat exchanger might have a limescale blockage that means once water is heated, it’s not leaving the heat exchanger quickly enough.

If heating sludge and limescale are a problem, can they be removed

The first thing to do, is to remove heating sludge and limescale. Your boiler repair company will be able to do this by running a hot flush. This involves running the boiler at high temperatures, whilst cleaning chemicals are circulating.

The system is then drained down, removing sludge and limescale. Once finished, the best preventive measure involves adding central heating inhibitor to the heating system. Then, adding a boiler filter (this will remove heating sludge in the future), and a limescale reducer (this will remove limescale from the heating system).

Other Biasi boiler issues

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