Operation; Troubleshooting - EWC Controls EWT-3707 Technical Bulletin

OPERATION

This thermostat will operate on a full 24vac (R&C) power supply. If
desired, two batteries (AA) may be used as a backup power supply
in the event of a power failure. If a full 24vac is not available, then
use two AA batteries as the primary power supply.
Start-up
The LCD will show the factory default display of 70°F (21°C)
when the batteries are first installed. The temperature will
update after a few seconds.
System Selector Switch
system
The System Selector Switch on the front of the
thermostat determines the operating mode of
cool off heat auto
the thermostat. You may select COOL, OFF, HEAT or AUTO.
CAUTION: Anytime you install or remove the thermostat from
the wallplate, slide the System Selector to the OFF position to
prevent the possibility of a rapid system function.
Fan Switch
fan
The Fan Switch should normally be located in
the AUTO position. The fan will be turned on
on auto
along with normal operation of your system. In gas or oil
furnace, the fan will be turned on by the furnace after its warm-
up delay. For electric heat, air conditioning, and heat pump
operation, the fan will turn on with the system. To run the fan
continuously, slide the fan switch to the ON position.
Review Current Set Temperature
Press either the up or down key once to see the set temperature.
The factory default is 68°F (20°C) when started with the System
Switch in OFF of HEAT, and 78°F (26°C) when started with the
System Switch in COOL.
Setting New Temperature
Press either or
temperature.
Press either or
set-point temperature. Hold the key down for over 2 seconds to
fast advance the set-point temperature.
Auto Shut Off
Your thermostat will automatically cut off in HEAT mode if the
room temperature rises above 95°F (35°C). It will cut off in
COOL mode if the room temperature drops below 45°F (7°C).
Note that if your system has malfunctioned and no longer
responds to thermostat controls, the Auto shut off will have no
effect.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
8
once and display the set
again to change your desired
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Filter Monitor
Your thermostat also keeps a record of the number of days your
filter has been in use. To maximize your system performance
and energy efficiency, change or clean your filter regularly.
When the total fan time reaches 400 hours, you need to clean or
change your system filter, "FILTER" will flash continuously until
the counter is reset to zero.
Press the center button to review filter usage. "FILTER"
displays with the total number usage in days.
To reset the Filter Monitor counter, press and hold the
center button for 3 seconds when the filter monitor day shows.
The display will blink and the counter will be reset to zero.
System Monitor
If the System Monitor Switch on the Heat Pump is closed,
completing the circuit from "R to L" the display will show "E5"
Backlighting
Your thermostat has an electro-luminescent lamp that backlights
the display for easy viewing in the dark.
When any key is pressed, the display is illuminated.
The display will remain illuminated for 5 seconds after the last key
is pressed.
NOTE: If the thermostat is in a Low battery warning condition, the
backlight will not operate. Replace with 2 new AA alkaline
batteries to restore the backlight function.

Troubleshooting

Problem Solution
Double Display Remove clear mylar cover over LCD screen
Check 24VAC and or batteries. Replace
No Display
batteries as needed
Entire Display
Replace Batteries
Dims
Batt
Replace Batteries
Check and correct as needed
Program does not
Settings: Time AM/PM
change at desired
setting
Check position of: System Selector Switch
Fan does not
operate properly
LCD displays
permanently
E1, E1, E3, E4
Replace Thermostat
or the Thermostat
does not function
at all
E5
Heat Pump Malfunction. Call Contractor
Hold
Home Today
Gas/Electric Switch
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