Rinnai ENERGYSAVER RHFE-308FTR Service Manual page 43

F. Heater does not (14) Is the thermistor
reach preset room OK?
temperature.
G. Heater stops (15) Shut off mecha-
during use (turns nism activated.
off prematurely: (... 12 flashing)
broken indicator
motor).
( 1 6 ) O F F f u n c t io n
activated.
(... 16 flashing)
(17) Overheat switch
activated.
(... 14 flashing)
H . A l l o t h e r Are there any loose or
problems. defective
connections?
Note: If a problem is not remedied by replacing the appropriate part, the wiring harness is defective (short
circuit, open circuit and/or defective connectors). Check for any short or open circuit. Lightly
wiggle wires and harness to check for loose or faulty connectors.
Energysaver RHFE-308 FTR
∗
Disconnect thermis-
tor from unit and meas-
ure resistance between
terminals. As there may
be some variance due to
temperature setting, use
the chart at the right as a
guide.
Check flame rod circuit
current. flame rod > 1.0
measure between
Was the heater used for Over ten minutes
a long period at a high
temperature?
1. Check for dust on air Is the dust build
filter, convection fan
and air outlet.
2. Check combustion
specifications
3. Is the convection fa (D) Grey - Pink
r e v o l u t i o n s p e e d
correct?
Measure motor coil
resistance. See (2)-2.
4. Check voltage at 2P
terminal D on PCB AC 50 - 108 V
(convection fan) .
- 38 -
(A) Yellow - Yes Replace PCB.
Yellow
No Replace thermistor.
o
0 C : 123 kΩ
o
20 C : 39 kΩ
(E1) Yellow - Yes Check for dust, FR
wire and connector.
µA.
No Replace PCB
(Disconnect,
connector and
lead.)
Yes Explain usage.
o
at above 40 C.
No Replace PCB.
Yes Clean.
up extreme?
No Go to (18) - 2.
Correct? Yes Go to (18) - 3.
No Adjust accordingly
Yes Go to (18) - 4.
90 - 180 Ω
No Replace motor.
HIGH - LOW Yes Check fan lock /
obstruction, spin, etc.
No Replace PCB.
Yes Repair
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