Question about Rinnai RHFE-556WTA Direct Vent Heater NG Air Conditioner

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Wont heat above 58 degrees

House is 1200 sq ft, Model : RHFE-556WTA, will only heat to 58 degrees - any suggestions?

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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.

Posted on Dec 11, 2009

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