This grill is in a salt water environment - ocean less than 100 ft away.
The left knob to increase the heat has become very hard to turn. Coincidentally, when this happened, the flames will not go very high, on either side. We know there is fuel, but there is not enough heat to cook food.
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Re: Flame is too small, does not get hot enough.
This sounds like it probably is a regulator problem - they tend to corrode very quickly in salt environment - i live on the coast too and have the same problem often.
First thing to try is to spray a little WD40 or similar into the regulator. often they will have a tiny hole somewhere in the body of the regulator usually on the side away from the gas bottle but there are many different types - spray in this hole in particular. Then give the regulator a bit of gentle violence - often the spring plate inside can stick or the valve itself and this can free it up.
No luck with this then get a new regulator - they are not usually expensive - make sure the regulator is the correct type for the gas you are using, they have different pressure settings for propane, butane, and all the assorted mixes.
The sticky left Knob is unlikely to affect the gas flow, although there must be some corrosion to make it hard to turn so it is possible that this has gone into the valve/pipe behind the knob - sometimes these valves can be dismantled and cleaned fairly easily, some are sealed units that just have to be replaced - if you want to try and are not sure what to do, try posting back with some photos and i could try and talk you through it, or try getting me on a live chat armed with photos, some WD40 and a selection of basic tools and some steel wire wool (stainless if possible).
Hope this helps and we can get you grilling for the summer, please ask again if not :)
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Salt water motor has more stainless parts (vs steel or other metal that will corrode). They usually have better quality internal parts as well. The connections in the head unit will corrode over time from being in salt environment. If you will be in salt environment it is worth the increase in price.
This is usually a regulator problem, or a gas leak where the regulator line attaches to the back side of the knobs. Test for a gas leak first. You can use a mixture of water and liquid dish/hand soap. Saturate the area where the hose connection is, turn on the tank, but leave the knobs in the off position and do not hit the igniter. If there is a leak, you should see some bubbling where it is. If there is no leak, turn the tank off, open the valves (turn the grill knobs on) and bleed the gas out of the lines. Once it has sat for a few minutes with the knobs in the "high" position, turn them off. Then leave them off and turn on the tank, followed by one of the knobs and ignite the grill. see if the flame went away. I've seen this happen where there is not enough pressure in the line. Turning the tank off, the knobs on, bleeding the line, then closing the knobs and opening the tank and letting the gas build up pressure in the line before turning the knobs back on or trying to light the grill should resolve it.
Next time you use the grill turn the gas on slowly. For some unknown reason when turned on quickly the regulator reduces the gas flow.
Another problem with some gas fittings is an auto shutoff if detects the slightest leak. Sometimes the shutoff is not 100% and allows a small amount of gas causing the weak flame.
The steps involved can vary slightly depending on your furnace model and pilot valve type, so if possible try and find the instructions inside the furnace door cover or in the instruction manual.
This is for a gas fired furnace, but applies to any gas-fueled appliance including water heater.
Two of the most common types of pilot valve body assemblies either have a red reset button and a gas valve or no reset button and a valve knob that can be depressed. But whichever type you've got, if you have an older model furnace with a standing pilot (flame is lit all the time) then this is the basic procedure.
Turn you thermostat to 80 degrees or to a setting that will demand heat. Make sure the thermostat is in "Heat" mode.
Go to the furnace and find the pilot valve. The pilot valve body is a box shaped device into which the main gas line will run and is located near the gas burners. It will usually have a gas **** or valve knob that reads "On, "Pilot" and "Off." Locate this gas **** or knob.
Turn the knob or gas **** to the "Off" position and wait about 3 minutes for any residual gas to clear away.
Find the pilot. It's located near the gas burner tube assembly in the furnace.
Get your match or lighter ready. Sometimes the pilot is hard to reach. If possible, try and use a long fireplace match when you light it. If you don't have a fireplace match then a butane BBQ grill lighter works well too. If you don't have that, then you can fasten a match to the end of a stick when you light the pilot
If you have a pilot with a red Reset button, turn the gas valve from "Off," to "Pilot."
If you have a pilot with no red button, turn the knob from "Off" to "Pilot."
Place the lit match or ignited lighter tip at the pilot and depress and hold the button or depress the knob as appropriate. Depress the button or knob for about 30 seconds. This maintains gas flow to the pilot until the thermocouple gets hot enough to open the main gas valve.
Once the pilot stays lit, slowly release the button or knob and turn the gas **** or knob from the "Pilot" position to the "On" position. This will ignite the burners and keep the flow of gas supplied as required for the burners as called for by the thermostat.
If the burners fail to ignite then it may be because the thermocouple did not get hot enough to open the gas valve. Wait a few minutes and then repeat the above procedure. This time hold the red reset button or depress the knob for about 45-60 seconds.
Once the main furnace burners ignite, adjust the thermostat to the desired setting.
If you've followed the previous steps on lighting the pilot and it still does not light after, or will not stay lit, then you probably have a problem with the thermocouple or an adjustment needs to be made to the pilot. You'll need a furnace service technician to replace or repair these parts.
You may find that the pilot lights, but it is an anemic looking flame. That's a different problem we'll look at in the next section.
If the pilot lights but the flame is a weak yellow flame, it will not get hot enough to heat the thermocouple to its set point allowing the gas valve to open.
A natural gas flame should be a bright blue with the tip of the flame having just a tinge of yellow. A propane flame should have a bluish green flame with a tinge of yellow at the tip. The flame should be strong enough to hit the thermocouple tip about 1/2 inch from the tip end. If the flame is weak or shaky looking, check to see that a breeze or draft is not blowing on it.
Adjusting the Flame There is usually a small screw on the pilot valve body that will adjust the flame. You may have to refer to the manufacturer's instructions to find the screw. Turn the screw as needed to adjust the flame throw.
Yellow Flame A yellow flame is caused by lack of air and incomplete combustion. It can be caused by a dirty pilot tube tip.
Split Flame This is caused by dirt in the pilot tube. Take a needle or small nail and gently clean the tube.
Flickering or Wavering Flame A flame that flickers is usually caused by a draft.
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