Rinnai RHFE-1004FA 38,400 BTU Energy Saver Ductless Heater - LP Gas
Problem for Rinnai RHFE-1004FA 38,400 BTU Energy Saver Ductless Heater...

Furnace not starting




By daveblairtom on Sep 12, 2009

" "
I turned on heater for first time. It immediatley shut down. Temp. indicator blinked "99"

Best Solution

posted on Sep 14, 2009
Very Helpful)

NtenseZ71

Rank: Master 
Rating: 98%, 6 votes
That small tube is the vent verification hose. Air passing over an oriface creates a vacuum. This negative reading, usually about -0.4 inches of water column is enough to trigger a vaccum diaphram switch telling the unit there is enough air flow through the unit to support combustion and remove byproducts safely
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Solution #2

posted on Sep 12, 2009
Not Rated)

daveblairtom

Rank: Apprentice 
Rating: 0%, 0 votes
Fixed my own problem. Found the owners manual on line. 99 means flue clogged. I took off a panel and found that a small tube, maybe a sensor of some \kind, had come off the duct going to the vent. After reattaching this tube it works fine.
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