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Biasi Boiler ER15 Fault Code

The Biasi fault code ER15 related to the water flow which we include Q & A or require an engineer for an emergency boiler repair.


The Biasi Fault Code ER15 Error Common Q & A

Just below, we have a list of common questions relating to the ER15 fault code on the Biasi Boiler.

Biasi Boiler ER15 Fault Code Error
  • What does the ER15 fault code mean on my Biasi boiler?
  • Will resetting my boiler fix the problem?
  • Is my boiler dangerous if it’s showing the ER15 fault code on the display panel?
  • Is the ER15 fault code something I can fix on a DIY basis?
  • How do I find a leak in my boiler?
  • Could a leak in my boiler contribute to other problems?
  • There isn’t a leak in my boiler, so why has my boiler’s pressure dropped so much?
  • What other problems occur with boiler pumps?
  • What are airlocks?
  • What kind of blockages can occur in my Biasi boiler?
  • What does the PCB have to do with a pump issue?
  • If I need to replace my pump or PCB, how much will it cost?

What does the ER15 fault code mean on my Biasi boiler

If your boiler is displaying the ER14 fault code on the control panel, it means there’s a problem with water flow. This could be due to lack of water (and therefore pressure) in the system, or the issue could lie with the pump.

Will resetting my boiler fix the problem

The problem isn’t a syncing issue that requires a reset. The boiler needs to be set to the correct pressure, or the pump needs to be fixed.

If the pressure is too low, the fix might be able to be done on a DIY basis. However, if it’s the pump that is the problem, the boiler’s casing will need to be removed. As removing the boiler’s casing is classed as working on a gas appliance, you’ll need to contact a Gas Safe boiler engineer. It’s only those with this accreditation that are legally allowed to work on gas boilers.

Is my boiler dangerous if it’s showing the ER15 fault code on the display panel

It’s unlikely that your boiler is dangerous, instead, it’s just having problems working to its full potential. However, if you see a drop in boiler pressure (or low boiler pressure), a leak could be present. And, depending on where that leak is, it could be causing expensive water damage to your property.

Is the ER15 fault code something I can fix on a DIY basis

You’ll need to check that the boiler’s pressure gauge is showing the right figure. Typically, you’ll want to see 1.3 bar on the pressure gauge, although in most instances, 1.5 bar is fine.

If the pressure gauge is showing a figure significantly below this, the boiler’s pressure needs to be increased. To do this, you’ll need to add water by opening the filling loop.

But first, you’ll need to consider a few things:

  • If the boiler’s pressure is too low, it’s likely there’s a leak, this needs to be fixed first, otherwise the boiler will continue to lose pressure
  • Whereby the boiler needs topping up significantly, it’s likely you’ll also need to bleed the radiators of air.

How do I find a leak in my boiler

If the boiler is leaking, it’s likely you’ll see pooling below the casing. As we’ve already mentioned, opening the boiler’s casing and working on the appliance is a job for a Gas Safe engineer. They’ll be able to find and fix the leak, top up your boiler’s pressure and reset the appliance to clear the ER15 fault code.

It’s likely that the leak stems from either blown pump seals, or a broken heat exchanger. In the case of pump seals, they can be replaced using a pump service kit. However, if the heat exchanger is cracked and needs replacing, it could cost over £400 to fix. With repair bills this high, it might be worth investigating the overall condition of the boiler; a new one with a long warranty may be the most cost effective option.

Could a leak in my boiler contribute to other problems

Water damage is a major killer of modern boilers. So, once the leak is found and fixed, the next step is to determine if any issues are present. The most obvious things to check are electrics. In older boilers, they’re not as well sealed as they are in newer ones. Anything from the fan to the printed circuit board (PCB) could have been damaged.

Your boiler repair company will be able to check each section of wiring, every connection and component using a multi-meter.

There isn’t a leak in my boiler, so why has my boiler’s pressure dropped so much

Leaks aren’t limited to within the boiler. Any part of your heating system that’s leaking, is going to lead to boiler pressure consistently dropping. Once the boiler’s pressure drops below 0.5 bar, it’s going to lockout; continued operation is going to put excess strain on multiple boiler components.

The leak could be something simple, such as a soldered copper joint that needs redoing. The best thing to do to locate and fix the leak, is to get a qualified heating engineer to come and help. The longer you leave the problem, the more damage the leak could cause in your property.

What other problems occur with boiler pumps

Assuming pressure and leaks aren’t the problem, the next step is determining if the boiler’s pump has any issue causing lack of circulation.

Typically, your boiler engineer will want to check the pump for:

  • Airlocks
  • Blockages
  • Power, as well as connections to the PCB

What are airlocks

Airlocks are small pockets of air that enter your heating system. If you’ve already tried topping up your system using the external filling loop, it’s likely this is how they’ve entered the system.

In general, airlocks occur in radiators. However, over time they can build-up in the pump and this is going to cause circulation problems.

Your boiler engineer can remove the boiler’s casing to access the pump, then bleed the pump via the bleed screw. If this is the problem, bleeding the air and resetting your boiler is going to clear the ER15 fault code.

What kind of blockages can occur in my Biasi boiler

Next up, your boiler engineer is going to want to check for blockages. The most common, comes in the form of heating sludge. This is rust that breaks off from radiators and inside pipework. As it travels around the heating system, it can get lodged just about anywhere, including the heating pump.

Your heating engineer can clean out the pump manually, then run a hot flush using cleaning chemicals. They’ll then add central heating inhibitor, fit a filter, and top up your system with water. The inhibitor will break down heating sludge, and the filter will catch it.

Additionally, in hard water areas, it’s advisable to fit a limescale filter.

What does the PCB have to do with a pump issue

The pump relies on the PCB to tell it when to operate, and when to shut down. If there’s a problem with the PCB, or connections/wiring to it, the pump isn’t going to know when to operate. Alternatively, the PCB won’t know when the pump is operating.

Your boiler repair engineer can test the pump and PCB for power using a multi-meter to determine which component is the problem.

If I need to replace my pump or PCB, how much will it cost

If the pump is the issue and needs replacing, you should expect to pay around £250 for a replacement, and for that replacement to take around one working day to fit.

The PCB is much more expensive, as it’s the heart of your boiler. A PCB replacement could be upwards of £400. As with the heat exchanger, it makes sense to get a general health check of your boiler. If other parts are likely to fail soon, it makes sense to invest this cash in a new boiler, not an old one that’s already causing you issues.

Other Biasi boiler issues

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