201Fa, 201Rfa Troubleshooting - Rinnai RHFE-551FA Service Manual

Troubleshooting
WARNING
There are a number of live tests that are required when fault finding this product. Extreme care should be used at
all times to avoid contact with energized components inside the furnace.
You MUST be a qualified service person before proceeding with these test instructions.
Before checking resistance readings, turn off power source to unit and then isolate each item to be checked from
the circuit by unplugging it.
When setting gas pressures on one of these units, please check the complete model number you are trouble-
shooting. Gas pressures and dip switches can vary among models. Always check the rating plate for complete
information and follow directions.
(AC IN)
Black-White
Black-Ground
White-Ground
(TR) Transformer:
Read voltage across:
Grey-Grey
Red-Yellow
Blank pin-Grey
Grey-Black
(SP) Sparker:
Read voltage across:
Red-Blue
The spark must be sensed as being at the correct location and intensity before it will allow the gas valve to open. Check
across Pin # 1-2 at Connector F and you should read 4-6 VDC potential. When sparking, if the spark is in the right location and
intensity the voltage potential will drop to almost 0 (zero) and then return to the 4-6 VDC potential.
(SV1 and SV2) Main Solenoid Valves: (Connector D)
Read voltage across:
Black-Yellow
*Resistance across each coils terminals should be 1400-2000 Ω when isolated.
(POV) Modulating Gas Valve (Connector G)
Read voltage across:
Grey-Grey
(BL) Combustion Blower Motor:
Read voltage across:
Black-White
Yellow-White
Red-White
12
(Connector B)
120 VAC CONNECTOR B
120 VAC
0 VAC
(Connector C) (AC Out)
Voltage Potential
90-110 VAC
30-42 VAC
15-21 VAC
180-220VAC
(Connector D) (Voltage potential while Sparking)
Voltage Potential
85-100 VAC
Voltage Potential
85-90 VDC
Voltage Potential
6-16 VDC
(Connector G) DC Motor 37VDC 8 Watts
Voltage Potential
7-12 VDC
4-5 VDC
10-30 VDC
Rinnai Direct Vent Service Manual
Read resistance
3-6Ω
0.8-1.5Ω
0.6-1.2Ω
155-260Ω
Read resistance
100K-120K Ω
Read resistance
700-1000 Ω
Read resistance
80-90 Ω
Read resistance
8K-10K Ω
4K-6K Ω
N/A
RHFE-201FA
Pin # 1-2
Pin #2-Ground
Pin #1-Ground
Pin Numbers
Pin #1-7
Pin #4-5
Pin #6-7
Pin #7-8
Pin Numbers
Pin #3-6
Pin Numbers
Pin #1-4
Pin Numbers
Pin #2-6
Pin Numbers
Pin #7-8
Pin #4-8
Pin # 3-8