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SERVICE MODE
The Service Mode can be accessed by pressing and holding the UP Arrow
and Enter buttons simultaneously for 5 seconds. You will first hear a
single beep when pressing the buttons, then a two-tone sound indicating
the action was successful. A moment later, you will see the first display of
the thermistor T2 alternating with its temperature displayed in the units
selected (degrees F or C). The Service Mode will time out after 15 minutes
of button inactivity.
Five functions are available in Service Mode: View Thermistors, Heating
Component Status and Control, View Faults and Counters, Personality,
and Software Revision. You may switch from one function to another
by pressing the Mode button. The operating mode LED will illuminate
to indicate which service mode is selected. An explanation of the five
functions follows:
View Thermistor (Hidden LED) - Each of the 5 thermistors can be
monitored for the temperature they sense. The thermistor designation
appears on the display and alternates with the temperature in degrees
of the units selected - Fahrenheit or Celsius. Pressing the Down Arrow
button switches the display to the next thermistor in the list. The following
table shows the thermistors' designations and their function in the unit.
Designation
T2
Tank (Water) Temperature
T3a
Evaporator Inlet Temperature
T3b
Evaporator Outlet Temperature
T4
Compressor Discharge Temperature
T5
Ambient Air Temperature
Heating Component Status and Control, EEV Operation (Heat Pump
(Only) LED) - This function displays the status (on/off) for each of the
heating components - Lower Element, Upper Element, Compressor (with
fan), and Fan - and allows you to turn it on or off. The first component
is the Lower electric element (LE). On status is signified by a 1 and off is
0. Pressing the Down Arrow button switches to the Upper Element (UE).
Pressing Down Arrow again switches to the Compressor (with fan) (Co).
Pressing the Down Arrow once more switches to the fan (Fn) . Only one
component can be on at one time. The electric elements will only stay
on for 5 minutes without refreshing by pressing any button on the front
panel. The compressor timeout is 10 minutes. Press the Down Arrow
button again to check EEV Operation. The position will be displayed. Press
the Enter button to open the EEV in increments of 10, from 80 to 450.
After reaching 450, pressing Enter will close the valve in increments of 10.
View Faults and Counters (Hybrid LED) - The control counts the number of
times a fault is recorded. A fault code is not displayed until the number of
counts in the fault table (refer to page 2) has been reached. For example,
if the upper element fails to draw current each time the control energizes
the upper element, the count will increase by 1. However, if the element
responds normally, the count will decrement by 1.
The View Faults and Counters function displays any fault codes in the
system. Pressing the Down Arrow takes you to the next fault code, if
any. If no fault codes are active, "- - -" is displayed. Pressing the Filter
button switches the display to the fault counters. The displayed fault
code alternates with its count value. For example, if the thermistor T3a
has registered 3 failures, its value will be 3 and the display will alternate
between "F5" and "3".
To clear all fault codes and fault counters, press and hold the Enter button
for 5 seconds and listen for the beep.
Personality (Electric (Only) LED)- This function allows the user to verify that
the correct parameter set has been programmed into the control board
(refer to Personality Table on page 2). The Personality allows the software
to properly control the heating system. The Personality of the water
heater cannot be changed, except by replacing the control board.
Software Revision (Vacation LED) - This function allows the user to view
the software revision that is programmed into the control. If the software
revision is not correct, the correct revision should be uploaded.
Exiting Service Mode - To exit Service Mode without waiting for 15 minute
timeout, press and hold the Up Arrow and Down Arrow simultaneously for
5 seconds and listen for two beeps.
Function
T4 Compressor
Outlet Sensor
T2 Tank Sensor
Temperature Sensors
Sensor
Description
Normal tem-
(wire color)
perature Range
T2
Tank (white)
30º F-160º F
T3a
Evaporator
15º F-130º F
Inlet (red)
T3b
Evaporator
15º F-130º F
Outlet (white)
T4
Compressor
30º F-250º F
Outlet (blue)
T5
Ambient (yellow)
15º F-130º F
PASS/FAIL COMPONENT OPERATION
Selected Mode
SS
LE
UE
Any
P
P
P
Any
F
P
P
Hybrid
P
F
P
Electric (Only)
P
F
P
Heat Pump (Only)
P
F
P
High Demand/Boost
P
F
P
Hybrid
P
P
F
Electric (Only)
P
P
F
Heat Pump (Only)
P
P
F
High Demand/Boost
P
P
F
Any
F
F
P
Any
P
F
F
Any
F
P
F
Any
F
F
F
SS = Sealed System
LE = Lower Element
UE= Upper Element
T5 Ambient Air
Sensor
T3a Evaporator
Inlet Sensor
Condensate
Overflow Sensor
T3b Evaporator
Outlet Sensor
Resistance
Resistance at
range in ohms
77º F
34K-1.75K
10K
57K-3K
10K
57K-3K
10K
188K-3K
55K
57K-3K
10K
Temporary Mode (if component failure is detected)
Runs in selected mode
Electric (Only) mode
Hybrid Mode (but uses SS when LE is called for)
Electric (Only) Mode (UE only)
Heat Pump (Only) mode
High Demand/Boost (but uses SS when LE is called for)
Control uses SS and LE based on demand algorithm
LE Only Mode
Heat Pump (Only) Mode
High Demand/Boost (but uses LE when UE called for)
Electric (Only) Mode (UE only)
Heat Pump (Only) Mode
LE Only Mode
Electric (Only) Mode, displays 1 fault codes
31-75036-1 03-15
Printed in USA
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