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I have a rheem Heater and it keeps constantly cutting on and off trying to reach it's desired temperature. I changed the thermostat yesterday, and it is working properly. However let's say if I set it to 78 it takes a while to reach that temperature, and will constantly cut on and off to acheive it's goal

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Hi, welcome to Fixya. First thing that I would recommend checking is the filter and air flow in general. The furnace may be overheating, cooling enough to run, overheating and so on. The second thing ( you didn't say so I'll assume it's gas heat) I would check is the tube coming off of the inducer. The inducer is the little blower that generally comes on before anything else on start up. There is a small rubber tube coming off of it. Pull the end of the tube connected to the inducer, then taking a straightened paper clip or similar poke the orifice in the nipple that the tube came off to clear any obstruction. Then retry the furnace. Let me know if this helps please.

Posted on Jan 26, 2009

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Williams wall heater 2509622. How do I keep the pilot on? It tends to turn off after it reaches the desired temperature.


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Dec 08, 2015 | Williams Heating & Cooling

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Why do we need to have to continuously adjust the temperature of the water when we're taking a shower. We have a new Rheem gas .hot water tank


It *may* not be a problem with the water heater itself necessarily. When you say "keep adjusting the water temperature when you're taking a shower" I presume you're talking about turning the shower hot/cold knob(s) and not the temp thermostat on the water heater itself.
If so, when it starts to run colder, turn the knob all the way to full hot. Is the water then very hot? If so, the water heater is working fine & doing its job, and the problem is likely to be in the shower faucet mixing valve itself. Sometimes a faulty one will expand the inner seals/cartridge as hot water flows thru it, and starts to (wrongly) restrict the hot water flow, thus causing the constant need to "turn the dial up a notch".

Oct 29, 2014 | Rheem Water Heaters

1 Answer

Raise temp above 120


Raising temperature above 120 degrees requires service call.
Or change dip switch settings and risk voiding warranty and causing service call expense.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#temperature

Earliest versions of Rheem tankless 2006-8 let you set temperature up to 140 degrees F using remote.
However the hotter setting caused error codes because the burner cannot keep up with both high temperature and large volume of hot water rushing through pipe. Especially in winter with cooler incoming water that must be heated more to reach temperature set point.
The burner simply cannot keep up.
So Rheem changed maximum temperature at remote control to tepid 120 degrees, which is not hot enough for folks wanting hot shower, or folks filling whirlpool tub because water in tub cools before tub fills.

Oct 27, 2012 | Rheem Tankless Water Heater Main Remote...

2 Answers

I have a Rheem 41VRP50N water heater. The water I am getting is luke warm on a good day. The burner fires up when I turn the thermostat to the highest temperature only. I drained the unit and flushed...


This condition can be caused by 4 different problems, or combination of these problems.
Good indicator would be to check temperature of water inside tank.
Put bucket under TP overflow tube and release water into bucket, then use cooking thermometer to gauge temperature. Stand back from scalding water that can shoot out of overflow.

If tank temperature is 120-130:
1) Crossover is suspect:
http://waterheatertimer.org/Crossover.html

If tank temperature is low:
2) Bad gas control valve thermostat is suspect.
I believe Rheem 41VRP50N has Honeywell or White Rodgers electronic gas control valve.
Open following link to identify gas control thermostat and see typical error codes.
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html#Honeywell
Replacement gas valve can be purchased from Rheem.

3) Combustion parts and tubes need cleaning, and bleed gas line for air and water contaminants.

4) Water heater has sediment build-up coating burner transfer surface and covering thermostat.
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html
Year of manufacture for Rheem water heater is 2nd two digits of serial number, so XX03.. would be 2003.

Add a comment and say what you did to solve problem.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jun 03, 2011 | Rheem Water Heaters

1 Answer

Rheem glas fury water heater rattling


Thermostat may be heating element hotter than normal causing a change in temperature causing the noise. You could try adjusting temp down a little on thermostat. It sounds like it's getting the water very hot and thermostat may not be working correctly.

May 21, 2010 | Rheem 81VP6S/430126 Water Heater

1 Answer

How do I turn the heat up on my Rheem egsp20?


To adjust thermostat, shut off breaker (power) to water heater, and remove access panel/cover. In behind that cover you'll see the thermostat control has a small slotted screw in center, with a small arrow attached to it. Use a screw driver and turn it slightly clockwise to increase temperature of water. Degrees are usually marked on it, for reference, just turn to point at desired temperature, but don't go too hot and scald somebody, especially any kids that may use it. replace the cover and any insulation that was there, and turn power back on.

Apr 09, 2010 | Rheem EGSP20 Point-Of-Use Electric...

1 Answer

PVS50 rheem power vent water heater do not reignite/restart/kick


I actually just installed one of these the other day, I found that the ignitor wires were straped to the gas inlet and they were shorting out,, I wraped them with electric tape and the unit came on and stayed as for the thermostat make sure your flue is clear of all obstuctions even outside, make sure on the vent on the top back of the unit is clean and no lint or dust has built up on it, you can take a small soft brush and just sweep it across it

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1 Answer

Cycles on and off after reaching desired temperature


The problem sounds like the thermostat which is probably a bimetal strip. It sounds like the bimetal strip is just constantly bending one direction then the other. It could be possibly adjusted by bending it -- this would be a trial and error process.

Or, it could be replaced.

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1 Answer

Model 460/5 can not control the heat


I would have to say that your issue is thermostat related.  The thermostat only send a signal when temperature is reached, not what the current temperature is.  So if it is malfuntioning, the desired temperature will never be reached.  Therefore, not sending a signal to cut the heat, even though it is 350.

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