Question about Water Water Heaters

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ER2 code my water is scalding hot! I changed all 3 zone valves but it has not fixed the problem. There is a beeping noise still and tbe H2O is scalding. Thoughts on what to try next.

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  • Water Master
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Could be the main thermostat not working/

Posted on Jan 09, 2017

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Adjusting Apollo hot water tank


I am not sure what you are asking, But i am going to assume that you want to know about changing the Temp on the heater for inside the house.
If the floor heat was installed properly than it should have a temperture manifold or adjustable thermostat for seperate heating.
You need to find the thermostat or manifold for the garage heat and set it at what ever temp you want the garage to stay at.
Then you can change the A B C knob to a higher setting A is cold B is warm ac is hot. So Increase your temp setting on the heater and this will increase your house water temp for hotter showers and faucet temps. However, they recommend not setting the temp above 120 degrees to prevent severe burns.
If you have a newer home increasing the Hot water heater temp setting may not change the temp at the shower or faucets if you have scald guard faucets installed in the house. This will require adjusting the scald guard valves on each faucet.
I recommend using a candy thermometer or digital thermometer to check the faucet and shower Temp prior to using them and make sure that you inform everyone in the house after you change the temp so that no one gets scalded.
I hope this answers you question, feel free to contact me if you need more help!
DR Wilkins

Oct 15, 2013 | Water Heaters

1 Answer

Water heater fires and runs for 2 or 3 minutes and then cuts off.It tries to refire 2 or three times but wont .Red light inside comes on as if it is out of gas.I changed the T-stat and ECO and it still...


First of all, lets see if water is hot already by releasing pressure relief valve slightly and seeing if water is already hot.BE CAREFUL NOT TO SCALD YOURSELF! Shut water pressure off, first, but be aware it will still be under pressure at first.. Just hold a cup, or something under it and open it up slightly, or at least feel pressure relief valve to see if it feels warm/hot to touch. May just be by-pass not set properly in back of water heater. Let me know if hot from pressure relief at outside on heater.

Dec 23, 2010 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

Hot water is spraying out the plastic coupler that comes out of the water heater up to the pipe. Want to know if there is any way to fix this problem in expensively.


First thing to do is wrap rag or towel around spraying joint to localize water.
Next, turn off power to water heater.
If gas, rotate knob to pilot so pilot light stays lit but burner does not come on
If electric, turn off circuit breaker.
Close cold-water shut off valve above tank.
Open tub valve to release pressure on water heater.

Wait for water to cool before working on water heater to avoid high pressure scalding water.
When finished, make sure tank is full of water and water comes out of tub valve before turning on power.

Water heater should not have plastic couplings.
I can't see your problem exactly, but water heaters have 3/4" nipples coming out of top.
Easiest solution is use flexible connectors from Lowes or Home depot.

geno_3245_158.jpg geno_3245_159.jpg

Flexible connectors are 24" or 30" long and have 3/4" nut on each end, so disassemble existing pipes using pipe wrench.
Lowes and Home depot can help you select appropriate pipe >> take several phone-photos of your pipes to home center so they can see your problem precisely.
Attach 3/4" male adapter on end of pipe.
Attach flexible connectors between pipe and water heater nipple.
Cold water line has shut off ... make sure this attached to nipple marked cold.
Make sure hot pipe is attached to nipple marked hot.
Use teflon tape on threads.

Add a comment if you need more help.

Dec 09, 2010 | Rheem Water Heaters

1 Answer

Rinnai Infinity 26 hot water system set to 55 degrees with remote temp adjuster. Water only luke warm for showers. Burnner working, water & gas pressure ok. Any thoughts ... Stephen


If you aren't getting any error codes, then the heater is probably doing its job. Your problem is probably somewhere in your plumbing system. The most common reason you get this sort of problem is due to cold water mixing in the hot water system. There are a number of causes for a "cross connection" :

-Faulty check valve
-Missing check valve on reciculation return line
-Faulty shower cartridge
-Thermostatic mixing valve set too low
-Faulty thermostatic mixing valve
-Faulty anti-scald valve

The easiest way to confirm a cross connection is to: 1) shutoff the cold water entering the tankless heater 2) open hot water valves around the house. If you still have water flowing at your hot water fixtures, then you have a cross connection.

Jul 09, 2010 | Rinnai Digital Remote Water Heater Control...

1 Answer

Beeping noise


E2 means hot water over shot, make sure to check boiler hot water system to make sure zone valve or control is staying closed when the call for boiler hot water to the water heater is isolated. Sometimes a zone valve will fail open or not close properly causing hot boiler water to constantly feed the water heater.

Dec 08, 2009 | Amtrol Water Heaters

1 Answer

Hot water out of taps is not very hot.


What is hot? Above 122F causes scald within 30 seconds. Get a temperature reading at tap. Use a candy thermometer if need be. If you want 140F water then your gas valve needs replacing.
In most code areas it is now illegal to deliver tap water over 125F to a consumer faucet.
You may love 140F but you jeopardize kids and Seniors.

Mar 03, 2009 | Honeywell Water Heaters

1 Answer

Water temperature varies while useing the hot water during a normal shower. jg


Try this before replacing the shower diverter valve.

If this problem is isolated to the shower only, then I would suggest that the shower diverter valve is equipped with an "Anti-scald" safety feature that can not be adjusted, however the temperature regulator/thermostat on the water heater can be adjusted to a lower temperature so as to not activate the the "Anti-scald".

Feb 20, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

Water heater is beeping with er- 120 flashing


if water heater is beeping E-2 it means that the water heater has gotten to high above water heater set point. Things to check

- there hot water being feed from boiler still
- is zone valve or pump isolated stopping flow of water to water heater
-check sensor readings

Jan 01, 2009 | Amtrol ST-12-C THERM-X-TROL ASME Expansion...

2 Answers

Water Heater Repair


If steam or excessively hot water shoots out of faucets, or you hear boilding sounds inside the hot water heater, the appliance may not be shutting off at its set temperature. The job of the temperature- pressure (TP) relief valve is to release excessive pressure from steam buildup, but this valve may have been improperly installed, or it may be faulty. Either way, this condition can be dangerous, both because hot water and steam can scald people and because enough pressure could build up to rupture the water heater. Immediately turn down the water heater’s temperature setting and allow the water to cool.

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