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  • If you use LPG for your gas appliances, the chances are you will have a changeover valve connected to the gas pipe supply when using gas bottles.

    LPG changeover Valves Problems
    LPG changeover Valves Problems

    We get asked many questions re LPG changeover valve problems.

    Below are just a couple of questions we get asked.

    1 I have an LPG changeover valve connected to four gas bottles but when I switch my boiler on it goes to lockout with a fault code showing on the boiler display.

    The fault code when checking the boiler instructions states gas valve or gas supply faulty.

    2 I have an auto changeover valve that does not change over.

    One of the first questions we ask our customers when they contact us about the problem is, what has changed, have you done anything to the gas supply.

    The next question is, how old is your changeover valve?

    LPG Changeover valves have a lifespan of around ten years.
    They will need to be changed every ten years as per the gas regulations.

    The hose pipes connected to the changeover valve, also known as pigtails also, need changing every five years.

    Both the changeover valve and hoses may need changing sooner if they start to deteriorate.

    LPG changeover valves can connect up to either a two-cylinder or four-cylinder gas supply.

    Four gas cylinders used to run the central heating boiler as well as the other gas appliances.

    The four-cylinder setup should incorporate a safety device on the changeover valve known as OPSO (overpressure shut off).

    The most common problem we come up against with the four-cylinder setup is the OPSO locks out.

    OPSO lockout tends to happen when you run out of gas, once the empty cylinders are changed over for full ones, the OPSO needs resetting.

    Most LPG changeover valves with OPSO have a small button that needs pushing in to reinstate the gas supply.

    Tip: Once the empty gas bottles have been swapped over for full ones, turn on the gas bottle valves very slow.

    Sometimes when turning on quickly, you will get a burst of high-pressure gas through, this can damage the changeover valve the OPSO will also go to lockout.

    It’s the most common problem we find when called out to LPG changeover valve problems.

    So when changing your gas bottles over always open the gas valve slowly.

    The gas supply will need purging through all gas appliances.

    Let’s take the cooker as an example, turn on one of the rings it will ignite and stay alight for a few seconds then may go out.

    Nothing to worry about, it just pushing the air through the gas pipe.
    Keep igniting the gas ring till the gas flame becomes constant.

    Most of the LPG changeover valve problems are down to maintenance.

    All LPG hose pipes, regulators, changeover valves and appliances should have an annual inspection.

    Sadly this tends to be forgotten till something happens, like a breakdown or smell of gas.

    LPG like any gas is extremely dangerous.

    Safety Tip

    If you think you can smell gas, turn off the gas supply straight away.
    Open all doors and windows, DO NOT US any lights or plug sockets.

    When you operate electrical appliances, they spark on the internal contacts, enough to cause an explosion.

    Remove yourself from the property and contact a Gas Safe Engineer.
    Do not call from

    LPG changeover valve problems can also be down to extreme weather conditions.

    The cheaper changeover valves can freeze in the colder months.

    When replacing your changeover valve, it’s best to pay a little extra than the cheaper imports.

    Don’t forget, all gas work natural gas or LPG must by law. be carried out only by a gas safe registered engineer.

    LPG changeover valve problems, how can we help?