Red Lights on Vokera Boilers – Diagnosing Boilers Via Lights

If you’re experiencing faults causing red lights on Vokera boilers, you’ve come to the right place — our 2-minute guide will discuss the common causes of red light indicators. 

Before we dive in, though:

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Red and Green Lights on Vokera Boilers: COMMON PROBLEMS

Whilst we can explain a few possible causes below, lights on their own can’t be trusted to pinpoint the exact problem. Boilers are gas appliances, and problems are difficult to diagnose. Always contact a Gas Safe engineer to get the problem fixed.

#1 – Red Light On, But Green Light Is Off

If the red light is on, but the green light is off, this signals a safety-based lockout.

Your boiler will lock out when sensors notice the boiler isn’t working correctly. Several things can cause a safety lockout, including:

  • A fan that doesn’t fire up during the start-up sequence, so the boiler is unable to expel flue gases
  • The pump isn’t circulating hot water, so hot water stays in the heat exchanger
  • The high limit thermostat has caused a lockout – your boiler is overheating

#2 – Red And Green Lights Are On

If the red and green lights are on for Vokera boilers such as the Linea, there’s another list of problems. For example, the following could be the case whether the lights are solid or flashing.

  • The water pressure in the system is too high or low (the boiler will usually lockout below 0.6 bar and above 3 bar)
  • Your Vokera boiler is stuck in service mode (most likely if it’s brand new, or you’ve just had a service from an engineer)
  • Sensors monitoring heating temperature have failed

If it’s water pressure (which is a common problem), there’s a good chance the lights are flashing on and off together for a few seconds at a time.

#3 – Red Light Off, But Green Light Is On

If you’re unsure why the red light goes off, but the green light stays on — with most Vokera boilers, this is normal.

The green light is a flame indicator. So, when you turn on your heating, the green light should stay on.

However, if it’s flashing, it could be a signal of:

  • Faulty sensors on the hot water
  • The boiler is on standby (i.e. newer boilers have a green power light, which is what is currently on)

What kind of fuel does your boiler use?

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When to Consider a Replacement Boiler

If you’re unable to resolve the issues described above, you may need to either repair or replace your boiler altogether.

Typically, if your boiler is still under warranty or you’ve got boiler cover, it makes sense to change the faulty part and get a few more years of service life out of your boiler.

However, a new boiler is your best option if:

  • Your malfunctioning boiler is not under warranty
  • You don’t have a care plan to take on the repair costs
  • Your boiler is quite old, and the cost of repairs will likely be over £300

In either of the scenarios above, getting a new part will only prolong your old boiler’s inevitable demise, meaning you’ll still have to replace it soon (hopefully not in the middle of winter).

To see how much a boiler replacement may set you back, we recommend you get a quick, no-obligation quote from Heatable. The online installer has some incredible deals with top boiler brands — like Worcester Bosch –, and its online calculator will help you accurately pinpoint the most suitable boiler brand and model for your home.

What’s Next?

Unfortunately, the lights on the display panel of a Vokera boiler don’t give enough detail into a fault.

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Try to make a note of any fault codes you see,  anything unusual (i.e. boiler is leaking, making sounds or the radiators are not heating up) and speak to a qualified engineer to help fix the problem.

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