Shutdown Procedure - Electrolux EN18WI30LS Service Manual

Shutdown procedure

On/Off button turn ON
NO
Water flow sensor detects
< 0.4 GPM
YES
Burner On lamp
goes off
Gas proportioning valve
closes
Primary gas solenoid
valve closes
Gas solenoid valve 1
closes
Gas solenoid valve 2
closes
Gas solenoid valve 3
closes
Fan motor post purge
Main flow control
valve opens fully
Fan motor stops
Anti-frost heater operation flow
NO
35
NO
Heaters turn on
NO
Warning
indication
Heaters turn on 30
Heat
NO
exchanger thermistor
37°F or higher
YES
50 minutes later
Heaters turn off
NO
*4 When less than 60 minutes after combustion, it is 50°F or higher.
Differs depending on set temperature.
*5
Freeze prevention control
Heat exchanger thermistor
normal
YES
Heat
exchanger thermistor
37°F or higher
YES
17
Air inlet thermistor
normal
YES
NO
Air inlet thermistor
Less than 37°F
YES
Heaters turn on
*4
NO
Has 20(or 50)
min passed
YES
Heaters turn off
*4
NO
Has 15(or 5)
min passed
YES
Air inlet thermistor
41F or higher
YES
14
Fan operation flow
Heat
NO
exchanger thermistor
19°F or lower
YES
Fan Turn ON
<1,200 rpm>
NO
Fan speed
61
<Target 500 rpm>
YES
NO
3 minutes later
YES
Fan Turn OFF
Heat
NO
exchanger thermistor
68°F or higher
YES
Heat
NO
exchanger thermistor
68°F or higher
YES
Heat
exchanger thermistor
37°F or higher
YES
Fan Turn OFF