Cannot raise temp setting above 32 degrees model# RTH111B

C = [(F - 32) * 5] / 9

7.March.2015

Bob, sounds like it is working as designed. If the temp indicates 97, of course it won't fire if you set 84 as the temp (97) is already above that. When you set 100, it is higher than 97 and the unit attempts to raise the temp those 3 degrees. If you don't think the water is already at 97, then there is a calibration problem with the temp sensor.

so it's not heating because it's not cold enough!!! How about raising the set point temp to match the indoor temp!!??!!

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

diesel or gas..

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.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

That temp is normal especially considering the ambient temp. A 50/50 antifreeze/water mix not only prevents freezing but raises the boil temp. The pressure in the system also does that. So, in reality, your boil temp is above 230 degrees.

Check the cooling temp setting and raise it up then try raising the heat setting up.

You may have a thermsotat problem if you get it to cool that low it will cause the condensor to freeze and will stop it from working.

That is a NONprogramable T-stat. There is no program to overide, therefore there is no need for a "hold" option. To set the temp, place the switch on the side marked

COOL
OFF
HEAT

to the desired setting, and push the up down arrows on the front until the display shows 80.

The DISPLAY will revert back to the current room temperature within a few seconds, and will keep the unit on until it reaches the desired temp.

The set temperature remains at 80, it just shows the current room temp.