Rinnai RHFE-551FA Service Manual page 39

Lock Out Checklist
• Ensure the air pressure switch is functioning properly. Ohm out the micro-switch located on the pressure
switch. Continuity will be read on meter when closed position.
• Ensure the vent system does not exceed fifteen feet total run, not exceeding 8 feet vertically, with no more than
two bent elbows.
• Check slide thermostat, set your meter to the 200K ohm scale. By reading across the white and black wires,
you should have and ohm range from 0 to 30 ohms from low to high on the RHFE 1001 units. One the RHFE
551 FA units read from red to red wires you should read 30 ohms from low to 0 ohms on high.
• Check thermistor operation by inserting meter leads into each end of thermistor plug. Disconnect yellow to
yellow from PCB, set your meter on the 200K scale. Your should be able to apply heat to the thermistor bulb
and see resistances decrease. Place some ice on thermistor bulb and resistances should increase.
10. Check current on all flame rods:
___RHFE 551 FA only has one flame rod. On the low burner this current should be 1to 2
micro amps and on high, current should be 5 to 6 micro amps.
___RHFE 1001 FA and RHFE 1001FA/VA uses only one flame rod on low fire. This is the
front flame rod nest to the electrode. Current on this rod should be 1 to 2 micro amps on
start up. There are three total flame rods on these units, and on high 5 to 6 micro amps
should be measured.
YOU MUST ENSURE UNIT IS GROUNDED !!
Rinnai Direct Vent Service Manual
RHFE-551FA
RHFE-1001FA
RHFE-1001FA/VA
39