How To Fix A Gas Geyser

In this article, we cover how to fix the most common problems on gas geysers so that you can enjoy your hot water again.

 

Diagnose The Problem

Before you can fix anything you need to get an idea of what the geyser is and is not doing. From there you can see if you need to get the service technicians out of if it is something you can fix on your own.

Most new gas geysers are electronic and will display an error code so it’s very simple for you to diagnose and know whether to call the manufacturer or your gas installer or if it is something you can do. Check your manual for error codes.

 

 

Some Common Problems and Solutions

 

 

Problem:

When I open the tap the geyser makes a ticking sound but does not ignite.

 

Solutions:

  • Your gas is finished

This seems silly but just go check. Sometimes there may be some gas in the cylinder, but it’s such a small amount that it can’t supply enough for operation of the gas geyser.

  • The gas shut-off valve is closed

Check if the shut-off valve of the gas line is open.

  • Air in the gas line

If you have recently changed your gas cylinders there is a chance that some air got into the line and is stoping the geyser from igniting. One way to fix this is to cycle the tap on and off continuously until the geyser ignites, open the tap for 30-40 seconds then close for 5 seconds and repeat. Altenitavly, most geysers have a pressure testing point where the gas could be bled until all the air is out the system, this is for installers only, please do not attempt if you are not a registered gas installer. Please ensure that your installer checks for leaks on the test point after bleeding the air out.

  • Gas pressure too high or too low

If the gas regulator is faulty it may give too much or too little gas pressure causing the various gas valves to not allow gas to flow. Please call a registered gas installer to test the pressure of the gas line. When calling an installer make sure he knows how to test gas pressures and actually owns a manometer (should look something like this: https://youtu.be/tWNFVRvbAqw?t=86) or a low-pressure testing kit of some sort. The gas pressures should be within the ranges labelled on the side of the unit.

 

 

Problem:

When I open the tap the geyser does nothing.

 

Solutions:

  • Lack of water pressure

If there is not enough water pressure the diaphragm inside the unit will not move and the geyser will “think” that there is no water at all. So you may need a booster pump with a water tank.

  • Debris in the Pipes or filter

If the water flow coming out of the tap is very low you may have debris in your pipes on the cold or hot water line. Check your geysers filter and clean if necessary. Or check and ensure there is no debris in your piping.

  • Too much pressure after the geyser

If you have very high water pressure the pressure difference may not be enough for the diagram to move enough, to warrant ignition. Check if there are any restrictions in the line from the geyser to the tap. It is common for plumbers to not clean out the pipes before finishing off, that debris then causes a restriction and results in an increase in pressure in the pipes after the geyser. Or you have a “water-saving” showerhead, try to remove it and see what happens.

  • Batteries are flat or no power

If you have a battery-operated geyser, try to replace the batteries. If you have a fan force driven gas geyser, check the unit has 220v power.

  • The geyser is turned off

It’s possible that someone may have accidentally turned off the gas geyser at the switch. Try changing the position of the on-off switch. If you can’t find the switch consult your manual.

If you have a fan force driven gas geyser. make sure the unit is on at the controller. If you do not have a controller most units default to being on when they have power. Side note: Just get a controller, it will save you gas when you select the exact temperature you require.

In the event of a power failure, some gas geysers will not automatically turn on when power is restored. Just turn it on again.

  • Gas pressure too high or too low

If the gas regulator is faulty it may give too much or too little gas pressure causing the various gas valves to not allow gas to flow. Please call a registered gas installer to test the pressure of the gas line. When calling an installer make sure he knows how to test gas pressures and actually owns a manometer (should look something like this: https://youtu.be/tWNFVRvbAqw?t=86) or a low-pressure testing kit of some sort. The gas pressures should be within the ranges labelled on the side of the unit.

 

 

Problem:

My geyser is leaking.

 

Solutions:

  • Replace heat exchanger, or entire unit

If the water is leaking from the heat exchanger (the thing with pipes wrapped around it), then the unit will need a new heat exchanger or even may even need to be completely replaced. This is most probably caused by a catastrophic failure of the burner and its safety features. Or (most likely) the heat exchanger froze during the cold of the night and the expansion of ice ruptured the heat exchanger. So in future read your manual for the steps involved to drain the geyser if you know the temperature may drop below 0.

  • It’s not the geyser

Check the piping that the geyser connects to is not leaking, this piping may just need tightening which you can do yourself.

 

 

Problem:

Huge flames are coming out of the geyser.

 

Solutions:

  • This is most certainly a faulty regulator, unfortunately, your gas geyser may be permanently damaged. You should definitely get your installer to inspect your gas geyser when they change your regulator.

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