Operation Flow Chart - Electrolux EN18WI30LS Service Manual

6. Operation Flow Chart

EN18WI30LS / EP18WI30LS
Water heating
Connect power
Main flow control valve
moves to initial
position setting
NO
Lightning safety
device normal
YES
On/Off button turn ON
10 years or more
Priority lamp (yellow) lights
Self-diagnosis
NO
Maximum output limited
Normal combustion
possible
Warning indication
YES
Normal combustion
1
Overheat prevention
NO
device (Thermal fuse) normal
(Less than 363°F)
YES
Warning indication
2
Main flow
NO
65
control valve operating
normal
YES
Hot water demanded
NO
Water flow sensor detects
> 0.5 GPM
YES
NO
Initial check
normal
YES
*1
5
Inlet water high
NO
temperature check
Normal
YES
10 Fan motor ON
11
Fan speed
(After 60 sec)
NO
(target 200 rpm)
YES
12 Igniter sparks
Primary gas solenoid
13
valve opens
Gas solenoid valve 1
14
opens
Gas proportioning valve
15
opens
(
1st, 4th, 7th:after 5 sec.
16
others:after 2 sec.
Flame rod NO
detects > 1A
YES
Igniter stops sparking
Burner on lamp
lights
Igniter stops sparking
Gas solenoid valve
17
opens or closes
(as necessary) *2
At max BTU, is
NO
outlet water temp. less
than setting
YES
Main flow control valve
2
activates
Flow is adjusted
NO
Safety device triggered
YES
Warning indication
The unit will continue to operature with
the code blinking.
NO
of use
YES
Self-diagnosis NO
Normal combustion
possible
YES
Warning indication
10
90
Self-diagnosis NO
possible
YES
4
Condensate trap
clogging
5
Inlet thermistor
open or shorted
6
Outlet thermistor
open or shorted
7
Heat exchanger thermistor
open or shorted
8
Exhaust thermistor
open or shorted
Circuit board
abnormality
Abnormal gas solenoid
valve drive circuit
9 Flame rod circuit
abnormality
(1A or more)
YES
Re-ignition NO
(8 times or less)
YES
Extinction NO
(5 times or less)
YES
18
NO (3rd)
High limit switch
is normal
)
Primary gas solenoid
valve closes
Gas solenoid valve 1
closes
Gas proportioning valve
closes
Gas solenoid Valve 3
closes
Burner On Lamp
goes off
14
16
1
Overheat prevention
device (Thermal fuse)
triggered (363°F or more)
9 6
Flame rod does
Outlet water temp.
not detect a flame
is too high
(0.5A or less)
*3 When the present fan speed is 500rpm more or less than target speed.
Fix problem
Disconnect power
Priority lamp turns OFF
Error code stops flashing
Turn power Off
90
99
14
Stop hot water demand
29
31
32
33
35
70
71
72
Fan motor stops
(Fan abnormality)
61
(Ignition failure)
11
*1 If the inlet temp is less than 122°F
(Flame rod)
or if the following statements
about K are true , the inlet temprature
12
will be normal (YES).
(High-limit switch)
20
*2
Primary gas solenoid
valve closes
Gas solenoid valve 1 Gas solenoid
closes
Gas solenoid valve 2
closes
Gas solenoid
Gas solenoid valve 3
closes
Gas proportioning valve
Gas solenoid
closes
Burner On lamp
goes off
31 33 90
32 61
5 7
Heat exchanger
Inlet thermistor
thermistor Abnormal combustion
open or shorted
open or shorted
6 1 1
Outlet thermistor
Fan speed
open or shorted abnormality
*3
13
Approx. 28.5
K >
+ water inlet temperature (°F)
Total water flow (GPM)
Set temperature Less than 122°F 122°F or more
K 136°F Set temp +9°F
Over Over Over Over
120,000 70,000 45,000 28,000
BTU BTU BTU BTU
ON ON ON
valve 1
ON ON ON
valve 2
ON ON
valve 3
35 29
99 94
8 4
Condensate trap
Exhaust thermistor
clogging
open or shorted
8
Using terms is equivalent
Exhaust thermistor
is too high
to more than 10 years
Over
16,000
BTU
ON