Max temperature for Rinnai 556WT restricted to 74 degrees
The landlord recently installed these heaters throughout my apartment complex. Problem: the Max. settable temperature for my Rinnai 556WT heater seems to be restricted to 74 degrees. The user manual shows that it has an 80F to 60F temperature setting range. They probably set that restriction because they're footing the gas bill. How do I disable that temperature restriction? I looked in the manual and it doesn't mention anything about the possibility of restricting the maximum settable temperature. Please advise.
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Re: Max temperature for Rinnai 556WT restricted to 74...
There is no way to restrict the setting and keep it UL approved. If you cannot get the heater above a certain setting you have either too small of a heater, too much outside air entering the apartment or the gas pressures are not great enough.
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I know that this is an old post but i had this same problem and i cant find a single answer to this problem anywhere on the net. Rinnai couldnt even give me an answer (let alone even call me back)
Well I figured it out. If you go onto Rinnai's website, you can download the manual, which has the codes and what they mean. Code 12 means Flame Failure. Still this didnt tell me enough. After taking the thing completely apart twice i finally figured out that the heater itself was perfectly fine.
The gas line was the problem. My gas line has a check valve on it right next to the heater. The check valve was not letting a consistent flow of gas to the heater because the heater was drawing too much gas at times, causing the check valve to start to close because it thought there was a leak (so to speak).
All i did was turn the gas valve behind the heater so that it was closed more (not letting as much gas flow through) so that it wouldnt trip the check valve. the heater now works fine and keeps a consistent temperature with no problems.
not knowing where you live or what the average temp is, it's tough to help you. If I may assume that the heater used to heat just fine and now it is not, I would look at either not enough gas supply (bad gas regulator at meter or tank), or the temperature probe is not giving the circuit board the correct reading. Remove the left side panel against the wall and look for a yellow wire with a black rubber tip. Take an ice cube and place it on the probe. The heater should turn on. Now pinch the probe with your hand. Your body heat will eventually tell the unit to shut off. If it has no effect, you will need a new probe (they call it a thermister). Have your gas company check the gas pressure and make sure it is within spec. The WTA model has some programming that may have scrambled. Reset the set temperatures by following the manual or going to Rinnai.us to view one. Hope this helps.
Your heater is only a 21K BTU heater. It is not meant to heat a whole house. We don't know how big you house is, however a 21K heater will not heat 4 or 5 rooms. The best you could expect out of a Rinnai 556 would be to heat a couple of rooms that are next to each other. You will never be able to heat rooms in your house that have doors or are down the hall a ways.
Raise the thermistor. It is a black rubber probe located on the back of the heater close to the coldest spot in your home, the floor. Raise it a few inches. To do this you will need to unhook it from its holder and open the front of the heater to unravel the extra length of yellow wire.
Return the heater while you can, we bought 2 of these and have had the same problem with both of them. One of the units they replaced all the guts and still had to replace it. The other unit is out of warranty and I am considering just replacing it to save on repair costs which will eventually equal more than the cost of the unit. The thermostat wire is located in the back and can be stapled to the inside wall up off the floor. It was not installed properly. Good Luck!