Rinnai RHFE-551FA Service Manual page 10

Fault Isolation Codes
Analog
Digital
Indicator
LED
Light
64 68 72 33
68 72 76 34
thermistor short
LO 60 64 53 Abnormal spark
60 64 68 61
Combustion Fan
64 68 70 ON/OFF Switch
LO 60 71 Solenoid Valve
80 72
72 76 80 73 Communication
HI
NA 49 Pressure Sensor No signal from the
NA 99
60 64 68 NA
72 76
10
Name
High-limit High limit thermistor
thermistor circuit is open.
disconnection
High-limit High limit thermistor
wire is trapped or
circuit touching bare metal.
• Sparker is not off
sensed
within 20 seconds of
ignition.
• 1st spark is not
sensed within 2
seconds
• 2nd spark is not
continuous for 1
second after
solenoid valve
opens
Abnormal RPM is not achieved
within a certain time or
RPM exceeds the RPM
limit.
The ON/OFF switch
Failure connects continuously
for more than 15
seconds.
For either solenoid
Failure valve, SV1 or SV2, the
signal and response
signal are different.
Flame Rod Flame rod output does
Failure not cease within 20
seconds
Data transfer between
Failure CPU and E2PROM
fails.
pressure sensor.
Flue Block The pressure sensor
signal is below its limit.
Flue Block Flue blockage has
been detected based
on fan speed.
Rinnai Direct Vent Service Manual
Definition
Check the circuit. (troubleshooting)
Check the circuit. (troubleshooting)
Replace sparker
Check for obstacle preventing fan from turning
freely.
Check wiring harness to motor for damage or
loose connections.
Check the circuit. (troubleshooting)
Replace switch.
Check the circuit. (troubleshooting)
Replace gas valve.
Check the circuit. (troubleshooting)
Replace flame rod.
Disconnect the power and re-apply power.
Check the circuit. (troubleshooting)
Check the flue and termination for proper
installation and blockage.
Check the flue and termination for proper
installation and blockage.
Corrective Action