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Open Roads Forum  >  Class A Motorhomes

 > Hot Water Heater not turning off

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dalmationlovers

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Posted: 04/21/11 06:10pm Link  |  Print  |  Notify Moderator

I have an Atwood hot water heater in my 87 Allrego Bay MH. Yesterday I fired it up to completely heat the tank and it seem to never shut off. After about 15 minutes I noticed that water was coming out of the relieve valve.

1. Is that normal? In my TT that never happened
2. Am I correct in that after the temp. has been reached the HWH is supposed to turn off?

Thanks
Arnold

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Posted: 04/21/11 07:01pm Link  |  Print  |  Notify Moderator

That heated water is expanding. There's very little room for it to do that in the water system. Water seeping from the pop off is normal on the initial warm up. At some point, yes, the burner will turn off, though it does take a few minutes.


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Posted: 04/21/11 07:06pm Link  |  Print  |  Notify Moderator

Agree with the previous post...if you "just filled it" then the water was probably pretty cold, which takes longer to heat and the expansion is more than normal. When I start out the first time, I occasionally open a Hot faucet for a brief moment to relieve pressure during the initial heat up process.


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dalmationlovers

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Posted: 04/21/11 07:09pm Link  |  Print  |  Notify Moderator

Thanks I will try that this weekend

rv2go

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Posted: 04/21/11 07:16pm Link  |  Print  |  Notify Moderator

It may help the leaking pop off if you re-establish the "Air Cushion" in the top of the tank.

1. Turn off the heat source. Electric or Gas
2. Turn off the water. Pump or City
3. Open a Hot water faucet inside the RV to release pressure.
4. Raise the lever on the pop off valve.
5. Remove the drain plug and let the water drain.
6. Replace the drain plug.
7. Put the pop off lever in the closed position.
8. Turn the water on.
9. When the inside faucet quits blow air and water is running,Close.
10.Turn on the Heat source.

When the water heater reaches the thermostat setting, it should turn off.


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halibutman214

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Posted: 04/22/11 07:37am Link  |  Print  |  Notify Moderator

rv2go wrote:

It may help the leaking pop off if you re-establish the "Air Cushion" in the top of the tank.

1. Turn off the heat source. Electric or Gas
2. Turn off the water. Pump or City
3. Open a Hot water faucet inside the RV to release pressure.
4. Raise the lever on the pop off valve.
5. Remove the drain plug and let the water drain.
6. Replace the drain plug.
7. Put the pop off lever in the closed position.
8. Turn the water on.
9. When the inside faucet quits blow air and water is running,Close.
10.Turn on the Heat source.

When the water heater reaches the thermostat setting, it should turn off.
BINGO! All I've ever done was step 1 thru 4. The air cushion is between the top of the tank and the relief valve, or at least it is on most of these. All you had to do was lift the relief valve until water stopped running and then close it.


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tony lee

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Posted: 04/22/11 08:02am Link  |  Print  |  Notify Moderator

Quote:

BINGO! All I've ever done was step 1 thru 4. The air cushion is between the top of the tank and the relief valve, or at least it is on most of these. All you had to do was lift the relief valve until water stopped running and then close it.


That will give you a small air cushion, but for best effect (maximum possible cushion), follow the entire procedure.

As for the OPs problem. How fast is the water leaking out of the relief valve.

A small driibble that stops once the water reaches the temperature may be OK (but shouldn't happen at all if the air cushion is correct), but if the water is running continuously then the water may never get hot enough to turn the heater off because of the cold water flowing in (this will also be indicated by your water pump running more than it should be). If the leak is major, try lifting the lever and letting it snap shut several times and any debris keeping the valve open might be flushed clear.


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Clay L

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Posted: 04/22/11 11:28am Link  |  Print  |  Notify Moderator

The following is info from the Atwood service manual on how to properly establish the air pocket.

Step 1: Turn off water heater
Step 2: Turn off incoming water supply
Step 3: Open the closest hot water faucet in the coach
Step 4: Pull handle of pressure-temperature relief valve straight out and allow water to flow until it stops.
Step 5: Allow pressure-temperature relief valve to snap shut, turn on water supply and close faucet.


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halibutman214

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Posted: 04/25/11 01:12pm Link  |  Print  |  Notify Moderator

That's why I did it this way.

Clay L

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Posted: 04/26/11 08:43am Link  |  Print  |  Notify Moderator

halibutman214 wrote:

That's why I did it this way.


As your post said you did it right.
I just wanted to emphasize that it's not necessary to remove the bottom drain valve.

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