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Troubleshooting Rheem Water Heaters

Rheem has been one of leading companies in hot water heating since their start in 1930's. They have products for both RESIDENTIAL as well as COMMERCIAL use. From instant hot water heaters (tankless water heaters) to storage hot water heaters, they have products that work with propane gas, electric water heaters, liquid propane water heaters and so on. On top of that, Rheem also provides with energy star rated products which save you energy bills as well.  Troubleshooting this products is simple, but working on them is fairly difficult due to the fact that every water heater in the market, no matter what the brand, is a hazardous product. Water heaters deal with material and equipment that could harm a person if not used correctly. Hence it is always recommended to hire a professional. Below is a table on how to troubleshoot Rheem gas water heaters. This will give you a good idea on how water heaters work.

  Universal Commercial Gas Troubleshooting Table




No Hot Water

Manual switch turned off

Blown service panel fuse or breaker

High limit switch tripped Damper Assembly not working Thermostat faulty

Thermostat out of calibration

Improper or loosewiring

Turn to ON Replace or reset

Cool tank by turning on a hot water faucet

Check and replace Check and replace Check and replace Check and replace

Not Enough Hot Water

Thermostat set too low Improper or loose wiring Thermostat not seated in tank Heater is undersized

Improper gas supply

Increase thermostat setting Rewire per wiring diagram Reseat thermostat

Resize and compare

Check gas pressure

Water too hot

Thermostat setting too high Thermostat out of calibration Thermostat not seatedin tank

Lower thermostat setting

Check and replace

Reseat thermostat

Slow hot water recovery

Improper gas supply

Check gas pressure

Noisy water heater

Sediment build-up on the bottom of the tank

Clean tank

Excessive relief valve operation

Excessive water pressure

(just a little water from the T&P)



Excessive temperature

( approximately 2/3 of tank volume is on the floor)

Check for open or closed system. Install thermal expansion tank. Install proper expansion tank on cold side


Check thermostat; lower setting or replace.

Thermostat not seated in tank

Rusty or black water

Anode rod dissolved

Excessive sediment build-up

Check anode rod and replace

Drain tank;replace tank if sediment build up is excessive

Water heater is leaking (Caution: Do not confuse normal T&P operation as a leaking tank.  Ifthe

puddle driesup, then look for a T&P problem.)

Cold in or hotout joints

T&P valve

Anode rod or hand hole gaskets

Inner tank has a pin hole


Also, checkfor signs of condensation when diagnosing a leaking heater.

Check joints and repair Check, tighten and replace Check, tighten and replace Replace water heater


(When diagnosing a leaker - you will notice a puddle of water on the floor, next tothe heater, that will not go away.)