Boiler Blocking Code; Outdoor Sensor Contact Open (Not Connected) - Rinnai Q series Troubleshooting Manual

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BL 05
Outdoor sensor contact
open (not connected)
Rectify error by determining if outdoor sensor
is faulty, wiring to senor is broken or damaged
or if the connection at terminal 18/19 on main
control board is properly connected.
8
008082013GW

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