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The what is the make and model of the heater?
Pull the cover off and you will see two sets of dip switches in the lower right corner. The set of 8 switches is the ones you want. Take the #6 of the bank of 8 and turn it on. Then hit the up arrow until you reach your desired temp.
Wait I'm sorry I typed that wrong. Turn numbers 3&4 on. Leave the rest alone
So to be clear. Bank of 8 switches. Numbers 3 & 4 should be on and 5 should be off. That'll give you 60°C
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Do you have a remote controller hooked up?
Give me the complete model number. From the sticker on the side. Might be something like Reu-vr2426
Okay. Here's the dip switch settings. This is the same thing I already told you, but maybe my typing it was confusing. So this is from the manual. Notice the model number.
You could call Rinnai. Good luck.