Rinnai ENERGYSAVER RHFE-308FTR Service Manual page 42

B . E r r o r c o d e (4) Is overheat switch
a p p e a r s s o o n 1 or 2 OFF?
a f t e r t u r n i n g (... 14 flashing)
heater on (normal If unit over heated, it
sequence cannot will turn back ON once
proceed). the unit cools down.
(5) Overheat thermis-
tor broken/short
circuit?
(broken...33 flashes
(short...34 flashes)
(6) Has the thermal
fuse melted?
(... 14 flashing)
(7) Is the combustion
motor wiring OK?
(... 61 flashing)
C. No spark (8) Is there any spark
leakage due to loose or
d i sco n n ec t ed h i gh
tension lead
(9) Is the spark unit
voltage low?
D. Spark fails to (10) Are the solenoid
produce ignition v a l v es ( S V
( s t o p s a f t e r
ON?
approx. 15 sec.)
(... 11 flashing)
(11) Is the modulating
valve (POV) OK?
E . I g n i t i o n (12) Is the modulating
occurs, but com- valve OK?
bustion indicator
does not operate.
( S p a r k e r st o p s
after approx. 15
sec) (13) Is the current of
(... 11 flashing) the flame rod (FR)
circuit >1.0 µA .
Energysaver RHFE-308 FTR
∗
With ON/OFF switch
OFF, check continuity
between both terminals.
∗
Measure resistance
between unit and
t h e r m i s to r ( D i f f e r s
according to tempera-
ture)
∗
With ON/OFF switch
OFF, check continuity
between both terminals.
∗
Check combustion
motor coil resistance
using same procedure
as (2)-3 above.
Check connection visu-
ally and by hand.
Measure sparker input
voltage.
∗
1. Check solenoid
, S V )
valve coil resistance
1 2
using same procedure
as (2)-5 above.
2. Check solenoid
valves terminal voltage.
1 . C h e c k t e s t p o i n t
pressure.
(Modulating valve P
2. Check position of
SW6 switches on PCB.
∗
3. Check modulating
valve coil resistance.
Measure test
pressure as in (12)-1
above.
∗
Check flame rod cir-
cuit current. (Discon-
nect, measure between
connector and lead.)
- 37 -
(H1) White-Red
< 1 Ω
(H2) Black - Red
< 1 Ω
(A) White-White
20 o C 78 kΩ
100 o C 3.6 kΩ
(H ) White-White
3
0 Ω
Red - Yellow
>1 M Ω
Good connection
and no leakage.
(F) Blue - Red
AC 85 - 110 V
(F) Black - Yel-
low
1.3 - 2.2 k Ω.
SV
1
1.3 - 2.2 k Ω.
SV
2
(F) Black - Yel-
low DC 78 - 100
V
Is it at the specified
pressure?
)
2
Refer to
(Gas changeover
switch)
(H) Grey - Grey
80 - 100 Ω
point Is it at the preset
pressure?
2
(E1) Yellow -
Yellow flame rod
>1.0 µA.
Yes Go to (6).
No R e p l a c e o v e r h e a t
switch 1 and/or 2.
Yes Replace PCB
No Replace thermistor
Yes Replace PCB.
No Replace temperature
fuse.
Yes Go to (9).
No Replace combustion
motor.
Yes Go to (10).
No Connect properly.
Yes Replace sparker.
No Replace PCB.
Yes Go to (11) - 2.
No Replace solenoid
valve.
Yes Go to (12).
No Replace PCB.
Yes C h e c k i n j e c t o r /
damper.
No Go to (12) - 2.
Yes Go to (12) - 3.
No Set to proper position
Yes A d j u s t r e g u l a t o r
pressure. If it does no
match, replace PCB.
No Replace modulating
valve.
Yes Go to (14) after
checking injector and
damper.
No A d j u s t r e g u l a t o r
pressure.
Yes Replace PCB.
No Replace flame rod.
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