Question about Hobart 42 in. AM14C-154 Free-standing Dishwasher

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Pressure release keeps draining hot water

I have a hobart 14c-model 32615 commercial dishwasher. we have two drain lines. when the washer isn't being used, the 1/2 inch line drains every 5 minutes or so. Why?
Thanks

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The 1/2" drain line you are referring to is probably the 3/4" line from the booster heater located to the left of the pump motor. The temperature/pressure relief valve is bad.

The booster heater could be overheating (bad thermostat), or you may not have an expansion tank on your building hot water system. The heating and explanding water in the booster has no where to expand to, causing a pressure spike high enough to pop the valve.

First, change the valve. I use a heavier-duty Watts XL40 valve, I purchase them from International Commercial Supply or Johnstone. Even if there is a cause for them to leak, once they start leaking they need to be replaced.

Once the new valve is in, power up and test the unit. Power up and fill the unit, then let the booster recover until it cycles off. Run a cycle, and check your rinse temperature. I like to see 190-192 degrees. If it went higher than 195 I'd turn the thermostat down. If it didn't shut off at all, and the relief blew, time to replace the thermostats in the booster heater.

Posted on Sep 12, 2009

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Hi

Thanks for using FixYa. Dishwasher not draining properly or not draining at all issues can arise due to different reasons. Usually, these issues are related to kinked hoses, knocked out disposer unit (if connected with the dishwasher drain hose) & clogged drain pump & filter.

Also note that dishwashers do not drain completely after a finished cycle and this is normal. Dishwashers are designed to leave some water in the unit to ensure that the heating element doesn’t overheat. If you suddenly begin to experience a large amount of water being retained in your dishwasher, you have a problem. Some of the most common reasons include that the drain hose isn’t working properly, the drain pump isn’t working correctly, or possibly there is a plumbing problem in your home’s drain lines.


First check whether the drain is not clogged or blocked and the line is not kinked. Check all the hoses for blockages & also clean the air gap. Has the disposer been replaced recently? If so, chances are the knockout is still in place. Simply remove the drain hose from the disposer, and knock out the plug. If the disposer has not been replaced, try removing the drain hose from the disposer and use a wet-dry vacuum (prepared for water, of course) to **** any water (and hopefully anything else) from the drain line. Then reconnect the hose, and test the unit. If you have checked the air gap and the drain hose and can’t locate the problem, then it is an issue with the drain pump of the dishwasher.

Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks

Rylee

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Hi

Thanks for using FixYa. Dishwasher not draining properly or not draining at all issues can arise due to different reasons. Usually, these issues are related to kinked hoses, knocked out disposer unit (if connected with the dishwasher drain hose) & clogged drain pump & filter.

Also note that dishwashers do not drain completely after a finished cycle and this is normal. Dishwashers are designed to leave some water in the unit to ensure that the heating element doesn’t overheat. If you suddenly begin to experience a large amount of water being retained in your dishwasher, you have a problem. Some of the most common reasons include that the drain hose isn’t working properly, the drain pump isn’t working correctly, or possibly there is a plumbing problem in your home’s drain lines.



First check whether the drain is not clogged or blocked and the line is not kinked. Check all the hoses for blockages & also clean the air gap. Has the disposer been replaced recently? If so, chances are the knockout is still in place. Simply remove the drain hose from the disposer, and knock out the plug. If the disposer has not been replaced, try removing the drain hose from the disposer and use a wet-dry vacuum (prepared for water, of course) to **** any water (and hopefully anything else) from the drain line. Then reconnect the hose, and test the unit. If you have checked the air gap and the drain hose and can’t locate the problem, then it is an issue with the drain pump of the dishwasher.

Please do rate the solution and revert for further assistance.

Thanks

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