Question about Rinnai RHFE-1004FA 38,400 BTU Energy Saver Ductless Heater - LP Gas
I turned on heater for first time. It immediatley shut down. Temp. indicator blinked "99"
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
Posted on Sep 14, 2009
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.
Posted on Sep 12, 2009
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Posted on Jan 02, 2017
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