Viessmann Boiler EE Fault Code
The Viessmann fault code EE is likely related to the air pressure switch and here we have Q & A or require an engineer for an emergency boiler repair.
The Viessmann Boiler Fault Code EE Error Common Q & A
Just below, we have a list of common questions relating to the EE fault code on the Viessmann Boiler.
- What does the EE fault code mean on my Viessmann boiler?
- Is my boiler dangerous if the EE error code is being displayed?
- What components will my boiler engineer need to look at to determine what the problem is?
- If the burner is the problem, what is the most likely fault?
- If the burner is faulty, how much will it cost to replace?
- How would the air pressure switch cause my boiler to lockout and display the EE fault code?
- My air pressure switch needs replacing, how much should I expect to pay?
- How could the PCB be causing the EE fault code to be displayed?
- If I need a new PCB, how much is it likely to cost?
What does the EE fault code mean on my Viessmann boiler
When your Viessmann boiler develops a fault, it’s down to the printed circuit board (PCB) to determine what the fault might be. It’s the PCB that gives and receives signals from all electrical parts in your boiler. That includes sensors, as well as functional components.
In the case of the EE fault code on Viessmann boilers, the problem is with a burner lockout.
Typically, this is due to a fault with the air pressure switch, but there are other things that can be connected to the EE fault code.
Is my boiler dangerous if the EE error code is being displayed
For most fault codes, the PCB will follow-up with the boiler locking out. When a boiler is in its locked out state, it’s unlikely to be dangerous. And, it’s for this reason that you shouldn’t attempt to reset your boiler. Instead, you should call a Gas Safe engineer.
Gas Safe engineers are the only people qualified to work on gas boilers. After finding the fault, they’ll fix it, and then reset the boiler for you, clearing the EE fault code in the process.
What components will my boiler engineer need to look at to determine what the problem is
There are two main components that your boiler engineer needs to check, and they are the:
- Burner
- Air pressure switch
After checking the most obvious components that cause the EE fault code to be displayed, your boiler engineer will also want to check the PCB.
If the burner is the problem, what is the most likely fault
The burner on your Viessmann boiler helps to heat up the heat exchanger. This then transfers heat from the burner, to hot water. If the burner isn’t working at its optimum, or at all, then hot water and heating temperaure in your property is going to be sporadic.
We find that the most common problem with burners in modern boilers, is a small blockage.
A physical burner blockage is unlikely. It would take years of carbon build-up to block the burner to a point where its efficiency is affected in a big way. But, that’s not to say this isn’t the problem.
So, your boiler engineer will need to check the condition of the burner. If there is a build-up of debris, this will need to be removed to enable the burner to work effectively.
A more likely scenario is that the jet connected to the burner has become blocked. Given these jets are incredibly small, it doesn’t take much to block them up; even the smallest piece of carbon is enough to completely block these jets.
And, as this is the component that supplies fuel to the burner, with a blockage, gas isn’t going to be allowed in, and a flame isn’t going to be present. At best, the flame that the burner can produce is intermittent or weak, causing the PCB to put the burner into fault mode.
As with the burner, the jet will need to be removed, cleaned and refitted. After doing so, your boiler repair company will be able to reset your boiler to clear the EE error code.
If the burner is faulty, how much will it cost to replace
If your boiler repair company has assessed the burner on your Viessmann boiler and is suggesting a replacement, you should expect to pay around £300. That’s going to include labour, and all associated parts needed for the install.
This is a quick job, and should be completed within a day, assuming they have instant access to parts from their local supplier.
How would the air pressure switch cause my boiler to lockout and display the EE fault code
When the EE fault code is displayed, and the burner isn’t the issue, the next place to look is the air pressure switch.
Before your boiler ignites, the PCB wants to recognise that the fan is running. It’s the fan that creates a draught, pushing dangerous gases out of the flue. To recognise whether the fan is running, the PCB will want to be receiving signals from the air pressure switch, showing that there’s been a change in air pressure, and that the fan is running. Without a running fan, the boiler could be dangerous.
Like all electrical components in your boiler, the air pressure switch can fail. This might be a faulty unit, or a simple wiring issue. Your boiler repair company will be able to determine which of these is the problem by using a multi-meter to test wires, connections and the air pressure switch.
Even the smallest break in a circuit could cause a huge array of problems with your boiler. For instance, due to intermittent signals from the air pressure switch, the PCB might be getting sporadic signals as to when the fan is working. And, that’s going to mean that the boiler cycles on and off as it receives these signals.
If wires are damaged, sections can be replaced. And, any loose connections can be secured. But in some cases, the air pressure switch is going to need to be replaced to fix the EE fault code.
My air pressure switch needs replacing, how much should I expect to pay
An air pressure switch replacement on your Viessmann boiler is likely to cost around £200. However, don’t expect your boiler engineer to have this part on their van; they’ll need to order it in from their local plumbing merchant.
Including time taken for delivery of parts, expect your boiler to be up and running within a few days.
How could the PCB be causing the EE fault code to be displayed
After checking the burner and air pressure switch, another problem component, could be the PCB.
The PCB is the central control unit within your boiler. Without an operational PCB, your boiler simply won’t work. And, if it’s running with a fault, your boiler is going to work sporadically. It might be giving or receiving the wrong signals, or not giving or receiving signals at all.
That’s going to lead to things such as your boiler turning on randomly, or not responding to demand from your thermostat or boiler timer.
To determine if the PCB is the problem, your emergency boiler repair company will need to test it using a multi-meter. This will help them to determine if the problem is with the PCB, or the wiring and connections to it.
As with the fan, if it’s wiring and connections that are the issue, they can usually be repaired. However, if it’s the PCB that’s causing the issues, a new one is going to be needed.
If I need a new PCB, how much is it likely to cost
Being the most important part in your boiler, the PCB is also one of the most expensive. Depending on the exact model of Viessmann boiler that you own, you should expect to pay around £400-500 including parts and labour.
But, before having a new PCB fitted, two things need to happen. First, your engineer needs to be certain that this is the cause of the EE fault. And secondly, have them check over the general condition of your boiler.
There are lots of other expensive components, besides the PCB. And, if multiple components are likely to need replacing in the future, it makes sense to replace the boiler, rather than the PCB.
Parts worth checking including the burner, gas valve, air pressure switch, fan and the pump.
Other Viessmann boiler issues
For more boiler issues regarding the Viessmann Boiler then please visit the Ideal Boiler Problems And Cures page.