Glow-Worm Boiler F.67 Fault Code
The Glow-Worm fault code F.67 relates to a flame signal and here we have Q & A or require an engineer for an emergency boiler repair.
The Glow-Worm Boiler Fault Code F.67 Error Common Q & A
Just below, we have a list of common questions relating to the F.67 fault code on the Glow-Worm Boiler.
- What does the F.67 fault code mean on my Glow-Worm boiler?
- What causes the F.67 fault code to be displayed on my Glow-Worm boiler?
- Is there a DIY fix for the F.67 fault code on Glow-Worm boilers?
- Why would the gas pressure be low on my boiler?
- How does a flue or condensate blockage contribute to the F.67 fault code being displayed?
- How will my engineer know if the adjustment on the gas valve is causing the problem?
- Can my engineer check the gas valve to see if it’s faulty?
- How can debris in the burner cause a problem with the flame signal?
- None of the above seem to be the problem, what’s next?
- If I need a new PCB in my Glow-Worm boiler, how much is it going to cost?
What does the F.67 fault code mean on my Glow-Worm boiler
When your Glow-Worm boiler develops a fault, the code helps a boiler engineer to determine what the problem might be.
In the case of the F.67 on your Glow-Worm boiler, the problem is with the flame signal. The boiler’s flame sensor can’t establish whether a flame is present, or the flame signal is fluctuating.
What causes the F.67 fault code to be displayed on my Glow-Worm boiler
The first thing for your boiler engineer to check, is that the flame sensor isn’t defective. If the sensor is defective, it might be giving a signal to the printed circuit board (PCB) to say that a flame isn’t present, even when the flame is stable.
Your boiler engineer will be able to test the flame sensor using a multi-meter. If it’s faulty, a replacement flame sensor is going to be needed.
But, this isn’t the only problem that can cause issues with the flame signal. Other issues include:
- Low gas pressure
- A flue or condensate blockage
- Gas valve adjustment
- A Faulty gas valve
- Debris in the burner
If all the above have been checked and the problem still hasn’t been found, your gas engineer will need to check:
- The wiring and connections to/from the PCB
- The PCB for faults
Is there a DIY fix for the F.67 fault code on Glow-Worm boilers
The F.67 fault code on Glow-Worm boilers, isn’t one you’ll be able to fix on a DIY basis. The boiler needs to be taken apart, and that’s a job for Gas Safe engineers.
Why would the gas pressure be low on my boiler
If the gas pressure is low on your appliance, it’s not going to be giving the gas valve enough gas. In turn, that’s not going to provide the burner with sufficient fuel, and the flame in the burner is going to fluctuate.
A common reason that low gas pressure occurs, is due to freezing weather. If your gas meter is outside and not protected from the elements, there’s a good chance that it’s the meter’s regulator that has frozen. If this is the case, the meter needs to be boxed in, and the pipes lagged; this will prevent this from happening again.
But, if you’ve had a new boiler, especially after fitting additional radiators and/or towel rails, it’s worth getting your engineer to check the gas mains. It might be that the gas main should’ve been upgraded to cope with the demand from the new boiler, which now needs more gas to heat up additional radiators and towel rails.
If the gas mains delivery of gas isn’t sufficient, it’s going to need to be upgraded.
How does a flue or condensate blockage contribute to the F.67 fault code being displayed
Two of the airways on your boiler, are the flue and condensate pipe. For your boiler to function correctly, these airways need to be completely free. If they’re not free, the boiler’s air pressure switch will notice a change in internal air pressure that it considers dangerous, and the boiler will lock out.
So, the first thing your Gas Safe repair engineer needs to check, is that the flue isn’t clogged full of debris. This is most likely to have happened if you have a vertical flue (going through your roof), that hasn’t been fitted with a flue guard. The flue needs to be removed to clear the blockage, and a flue guard fitted.
If your condensate pipe is the issue, it’s likely the problem is the weather. Below freezing, condensate pipes are known to freeze. That’s going to lock out your boiler.
Although these pipes can be thawed out and the boiler reset to clear the F.67 fault code, it’s wise to put preventative measures in place.
First, your boiler engineer should make sure the pipe is routed closer to vertical. This stops any condensed gases lingering in the pipe, where they have a better chance of freezing. And, they can either fit a larger condensate pipe, or lag the pipe to protect them from the elements.
How will my engineer know if the adjustment on the gas valve is causing the problem
The gas valve on your boiler comes pre-adjusted from the manufacturer. However, your engineer can check that the adjustment hasn’t been messed with and ensure it’s suitable for your property’s heating system.
Whilst it’s rare that gas valve adjustment is needed, it’s something worth investigating, as it could mean avoiding an expensive replacement part.
Can my engineer check the gas valve to see if it’s faulty
After quickly checking to ensure that the valve is adjusted correctly, they’ll need to check that the valve’s operation isn’t what’s causing the issue.
The first thing they’ll look for, is a valve that’s partially working, but is sticking. Gas valves are prone to sticking slightly over time. In this case, it’s likely that the gas valve is sticking partially closed, even when the boiler’s PCB has asked it to open. And, that’s going to mean that the burner isn’t being provided with the gas supply that it needs; that causes flame instability.
If they can free the valve so it’s no longer sticking, a replacement won’t be needed.
But, if the gas valve isn’t responsive, it’s a possibility that the gas valve is completely faulty. They can check the valve is getting power with a multi-meter.
If they can determine that it’s the gas valve that is at fault, a replacement is going to be needed. Typically, you should expect to pay around £250-300 for a replacement gas valve on your Glow-Worm boiler.
How can debris in the burner cause a problem with the flame signal
In the burner, there’s a small jet, and that helps give a constant supply of gas to the burner. But, these jets are partial to getting blocked with small pieces of debris. This can be something such as a small spec of carbon. Even a partial blockage is going to mean that the flow of gas is affected.
Luckily, you shouldn’t need a new burner. Your boiler repair engineer will be able to clean out the burner and jet. After a reset, the F.67 fault code on your Glow-Worm boiler should be cleared.
None of the above seem to be the problem, what’s next
If your Gas Safe engineer has explored all the other options, the next step is to start checking and testing the PCB. It’s the PCB that gives and receives signals to all other components in your boiler. So, if this fails, it’s going to throw up a whole host of problems.
More importantly, it’s the PCB that determines which fault code is the best one to be displayed. And, it stands to reason that if the PCB is faulty, it could be displaying the wrong fault code. Or, it could be displaying a fault code, even when a fault doesn’t exist.
So, your boiler engineer will need to test the PCB. They’ll do this using a multi-meter. That’s going to allow them to test all the connections and wires that go to/from the PCB. If any of these are loose or damaged, then they can be repaired. After resetting the boiler, the F.67 fault code should be cleared.
If I need a new PCB in my Glow-Worm boiler, how much is it going to cost
If all else fails, and the PCB is faulty, it’s going to need to be replaced. But, you need to be sure that other parts aren’t in poor condition, and will therefore, need replacing soon too.
A PCB replacement is going to cost in the region of £450-500. And, it makes no sense investing that kind of cash, if other expensive parts are about to fail.
Other Glow Worm boiler issues
For more boiler issues regarding the Glow Worm then please visit the Glow Worm Boiler Problems And Cures page.