263Fa, 263Faii, 263Rfa Troubleshooting - Rinnai RHFE-551FA Service Manual

Troubleshooting
WARNING
(AC IN)
Black-White
Black-Ground
White-Ground
(TR) Transformer:
Read voltage across:
Gray - Gray
White - White
Red - Red
Black - Yellow
Black - Blue
(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, SV2, POV) Main Solenoid Valves:
Read voltage across:
SV1 - Yellow ~ Black (hold)
SV2 - Yellow ~ Black (assist)
POV - Gray ~ Gray
*Resistance across each coils terminals should be 1400-2000 Ω when isolated.
(BL) Combustion Fan Motor: (Connector CN8) DC Motor 37VDC 8 Watts
Read voltage across:
Black-White
Yellow-White
Red-White
16
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.
120 VAC
120 VAC
0 VAC
(Connector CN2 AC Out)
Voltage Potential
98-125 VAC
98-125 VAC
35 VAC
200-220 VAC
12-20 VAC
(Connector CN4)
Voltage Potential
85-100 VAC
Voltage Potential
85-90 VDC
85-90 VDC
6-16 VDC
Voltage Potential
7-12 VDC
4-5 VDC
10-30 VDC
Rinnai Direct Vent Service Manual
Pin # 1-2
Pin #2-Ground
Pin #1-Ground
Read resistance
4--16 Ω
4--14 Ω
1--3 Ω
250--400 Ω
1--3 Ω
Read resistance
100K-120K Ω
(Connector CN4)
Read resistance
1400-2000 Ω
1400-2000 Ω
80-90 Ω
Read resistance
8-10 KΩ
4-6 KΩ
N/A
RHFE-263FA
RHFE-263FAII
RHFE-263RFA
Pin Numbers
1-7
2-3
4-10
5-8
8-9
Pin Numbers
3-6
Pin Numbers
1-4
1-4
2-6
Pin Numbers
7-8
4-8
3-8