Suddenly, rangetop burners not getting propane..

[groundhogy]

I can light them, but they are weak and will burn out.

-propane fridge happy
-bled tank thinking overfill
-all three burners same problem
-tried the spare 20lb tank (known good, was used previous to this prob)
-hot water heater ok, strong

It seems to be pointing to the range, or the feed to the range?

[dougrainer]

groundhogy wrote:
The main regulator is 3-4 years old.
It switches between the two 30lb tanks.

The "MAIN" regulator and the Auto Switch over are the same part. You should replace both as a set for best results. Almost ALL replacements are the set, not the regulator and then the Auto switchover valve. A BAD Water Heater Flame will still heat the water but takes a long time. Your Oven/Range has its OWN regulator and that reduces the Pressure from 11.5 down to 10 which is what the Oven runs at. You NEED a Pressure test to make sure you have 11.5 inches pressure. OIL in the LP lines can also cause your problem, but usually affects all LP appliances. Not having a pressure test, you are just left replacing various parts. Doug

[enblethen]

What you call the main regulator is the one you should have changed out!

[groundhogy]

The main regulator is 3-4 years old.
It switches between the two 30lb tanks.

[groundhogy]

There is propane coming in.

The burners are weak.
The oven burner runs but wife says it was stronger.

Refrigerator running (but isnt that like a very small flame?)
Hot water heater makes hot water

[Harvard]

groundhogy wrote:
I swapped out the regulator and NOTHING.
Still the same.

What now?

Do a "Soap Bubble" test for gas flow/pressure at input to the regulator in question.

If no bubbles then troubleshoot "why no pressure".

Has this stove ever worked properly in the past history?

[groundhogy]

I swapped out the regulator and NOTHING.
Still the same.

What now?

[groundhogy]

I think it’s looking pretty stong that its the 10” pressure regulator.
I’m going to buy one and try it.

[Matt_Colie]

When you get through with the above, lift the cook top and see if there is either a valve or a regulator under there.

If there is a valve, check that it is open and clear.

If it is a regulator, check with the manufacturer to find what the burner pressure is supposed to be and how they advise that you check it.

Matt

[Dusty_R]

What happens if you light one burner at a time, and let it burn for a minute then a second one, then third? Watch to see if the first burner fades when next burner is lit.

[Carl_n_Susan]

You didn't say what RV you have, but if the stove is in a slide out, check for a kink in the flexible line under the slide.

[Harvard]

Could be a p-trap in the propane feed line to the range and is filled with oil. I have seen this in the past and it was a problem when cool at night but not so during the heat of the day. At the time I assumed the viscosity of the oil changed with temperature. The most likely place for the trap is where the copper line connects to the propane distribution manifold below the floor of the RV (ie outside)

[beemerphile1]

I would put a manometer on the system and check the pressure from the main regulator and then the stove regulator. The alternative is to guess and start throwing parts at it.

[enblethen]

Pick up a new main regulator.

[groundhogy]

I seem to remember when my main outside regulator failed...
I think it was the furnace that was the tip off. It wasn't getting enough propane? The light users were all happy if I recall.

Is it the heavy users that first show problems when the regulator fails?