Whirlpool Energy Smart 188414 User Manual download pdf (Page 12)

The Electronic Thermostat

IMPORTANT: The Energy Smart

Module (ESM) must

be removed before attempting to access the thermostat.

NOTE: for the Electronic Thermostat (ET) changes to re-

main in effect the Energy Smart

Module (ESM) must not

be reconnected, also read the “Water Temperature Regu-

lation” under the “Operating Your Water Heater” section. If

the instructions are not clear, contact a qualiﬁ ed person.

The Energy Smart

Module (ESM) is intended to serve

as the primary interface for operating the water heater;

however, the Electronic Thermostat (ET) may control the

water heater in the absence of the Energy Smart

Module

(ESM).

The Electronic Thermostat consists of an electronics box

that contains a low voltage power supply, the thermostat

set point knob, relays to switch between the upper and

lower heating elements, one control thermistor, a connec-

tor for the lower element control thermistor, microelectron-

ics to convert the thermistor signals and perform switch-

ing and other logic functions, and a connector to tie the

Electronic Thermostat (ET) to the Energy Smart

Module

(ESM) located on the front of the water heater jacket. The

majority of the self-diagnostics are located in the Electronic

Thermostat (ET), including the dry-ﬁ re protection intelli-

gence. The thermostat circuit is designed so that when the

upper heating element calls for heat, the power is directed

to that element even if the lower element is also calling for

heat.

Diagnostic LED Light

The Green/Red LED light indicates the status of the elec-

tronic thermostat (See Figure 10A).

• Green LED will signal normal operation. The green

LED will blink 2 times per second to indicate that power is

applied to the upper heating element and at a faster rate

(4 times per second) to indicate that the lower heating ele-

ment is powered.

• Red LED will ﬂ ash error codes. If a fault is detected by

the electronic thermostat, the LED light indicator will use

the red LED to indicate the fault detected. The ﬂ ash code

sequence is to consist of 1/2 second ﬂ ashes of the red

LED each separated by a 1/2 second off period.

The number of ﬂ ashes indicates the fault code number.

(See diagnostic code chart section in this manual).

After the last 1/2 second “on” period, the LED will remain

off until a total of 5 seconds has elapsed for the fault in-

dication cycle (there is a 5 seconds delay before the fault

ﬂ ash pattern repeats). After the 5 seconds are completed,

the fault indication cycle is repeated starting with the ﬁ rst

1/2 second-ﬂ ash. The ﬂ ash sequence will be repeated as

long as the fault remains. Only one fault can be declared

at a time. NOTE: the green LED is turned off when a fault

code is being displayed, even though the heater may be

operating in limp mode with an element on.

See diagnos-

tic code chart section in this manual.

Overriding The Energy Smart

Module (ESM)

If the Energy Smart

Module (ESM) is not working, simply

unplug the interface module and turn the set point knob

on the Electronic Thermostat (ET) to the desired tempera-

ture (See Figures 10A & 10B). To replace a broken or

damaged ESM module, see page 22 for ordering informa-

tion.

Figure 10A

Electronic Thermostat (ET)

Diagnostic LED Light

ECO Reset Button

Setpoint

Knob

( Remove Only After Power Is Turned O

When Replacing Element, see page 16 )

Plastic Guard

Upper Element

Low Voltage Wiring

Energy Smart®

Module (ESM)

Figure 10B

Electronic Thermostat (ET)

Electronic

Thermostat (ET)

Thermostat

Setpoint Knob

Junction Box

Wiring Harness

Thermistor

Wire Harness

NOTE: Smart Grid will be disabled when the Energy

Smart

Module (ESM) is disconnected from the junction

box wiring harness.

Electrical Shock Hazard

Do not remove the plactic

guard from over wiring.

Do not touch electrical wiring.

Failure to do so can result in

death or electrical shock.

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Whirlpool Energy Smart 188414 User Manual Page 12

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