INTELLISWITCH™ FAQ’s (Frequently Asked Questions)
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Q. Why can’t I change my settings?
A. The Intelliswitch™ may be locked. If the Lock light is illumi-
nated, the control is locked. To unlock, press and hold the left &
right arrows simultaneously for 5 seconds. The Lock mode can
also be protected with a PASScode. If the PASScode option is
on, an attempt to unlock the control will display PASS and then
a 0000 prompt. A four-digit code (available in the installation
instruction book Appendix) must then be entered to unlock
the control. Use the up and down arrows to select a number
and the left and right arrows to select the digit to edit. Press OK
when done. Note: If the AutoLock setting is on, the control will
re-lock if there is no activity after 5 minutes.
Q. Why won’t my heat work, even though fans are running?
A.
The thermostat(s) or speed sensor may need adjusted or
replaced.
1.) Make sure that the thermostat probe and/or remote ther-
mostat are in the “On” position and set above ambient (room)
temperature.
2.) Check internal and external thermostat status in the Diag-
nostics Menu for a faulty thermostat. To do this, hold the right
arrow for five seconds until DIAG appears, then arrow down to
the ts setting, if it displays “1” then the thermostat(s) is working
(there is a call for heat).
3.) If no external thermostat is used, check to see if the internal
probe is attached to the control board. Disconnect power to
the unit, remove the display board and check that the beige
sheathed cable is attached at both ends. If the thermostat(s)
and settings are correct and you are still not getting heat, then
check to see the fan speed. to do this, press the down arrow to
reach the Mode/Fan speed setting. Use the right and left arrow
to change the fan speed.
4.) Check to see if you can adjust the fan speed. If the speed
sensor is bad there will be no speed control and the Intel-
liswitch will not let the heat come on. If it is too difficult to de-
termine a change in speed, the speed sensor can be checked by
entering the DIAG menu and checking the first error code. If ER
10 displays, the speed sensor is recognized by the Intelliswitch.
If the code ER 11 is displayed, the Intelliswitch does not recog-
nize the sensor, and it may be faulty or need adjusted closer to
the trigger bar. Turn off the power to the unit and remove the
screen to check the distance between the sensor and the trig-
ger located on the left side of the motor (use the bottom access
cover for steam/hot water heated units). The sensor should be
less than 1/16” from the trigger face. Check distance at both
ends of trigger. Adjust if necessary.
5.) If there is still no heat or speed control, you may need a new
speed sensor: consult factory.
WARNING: TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:
Before servicing or cleaning unit, switch power off at service panel and lock the service disconnecting means to
prevent power from being switched on accidentally. When the service disconnecting means cannot be locked,
securely fasten a prominent warning device, such as a tag, to the service panel.
www.intelli-how2.com
Even though every MaxAir/Zephyr unit is individually tested at the factory before shipment,
on occasion improper functionality may be experienced. Here is a list of common questions:
Q. Why won’t the Intelliswitch light up?
A.
There may not be power to the control.
1.) Check to see if the main power is turned on to the unit. Your
air curtain may have multiple disconnects, be sure all are turned
on.
2.) Verify that there is power to the board.
NOTE: ONLY QUAIL-
IFED PERSONS SHALL CHECK POWER IN THE UNIT WITH THE
POWER ON.
The power terminals are located directly behind
the display. Remove two Phillips screws from the Intelliswitch
display to expose the power terminals and check the line volt-
age at spade terminals L2 and 120, 208 or 240 (depending on
the voltage supplied to the unit).
3.) Check the ribbon cable connections to the display board for
a loose connector or improperly connected cable (see Installa-
tion Instructions for correct cable connection).
4.) If display still doesn’t light, unplug the speed sensor and
thermostat probe (if a heated unit) from the control board. If
the display lights, plug one component back in at a time to see
which one may be shorted. The faulty component will make
the display go blank again.
5.) If there is line voltage power at the board terminals, the
ribbon cable is correctly connected, the speed sensor and the
thermostat are working, and it is still not working, you may
need a new circuit board: consult factory.
Q. Why won’t my fans shut off?
A.
The Intelliswitch may be in the wrong mode or mis-wired.
1.) Check to see if the control is in the “ON” mode, if it is, then
change the Mode to another setting.
2.) The T-Stat Mode may be set to the “both” setting and the
thermostat is calling for both Fan and Heat, change the T-Stat
Mode to “HEAT”.
3.) If there is a door switch and the unit is in a mode that is acti-
vated by it, there could be a short, mis-wiring or mixup in com-
ponents. Close the door and check the door switch status in the
Diagnostics menu. Hold the right arrow for five seconds until
DIAG appears, then arrow down to the ds setting, if it displays
“1” then the door switch signal is closed (there is a call for fan). If
the door is closed, the signal should be “0” or open.
4.) There could be a short in the field connections to the door
switch or the door switch leads could be mis-wired. To test,
disconnect the door switch connection at the unit. Opening the
wiring tray on top of the unit and be cautious of high voltage
connections. Disconnect the blue wires labeled 9 & 10 from the
field wiring to the door switch or make sure they are not tied
together. There is no danger of getting shocked because the
signal is 5 volt dc. Be sure not to touch the blue wires to any-
thing metal (or grounded). The unit should shut off when it is in
