Electro Industries EM-MC00 Series Installation & Operating Manual page 26

Troubleshooting
Display is blank and nothing
is turning on
Unit is not producing heat
Unit is not delivering
adequate warm air
temperature
The "Status LED" is
blinking
07/29/2019
 This unit includes a 2A fuse located on the control board, verify it is
in good working condition.
 If 2A fuse is open, replace.
 If 2A fuse is not open, check the primary and secondary side of the
transformer to ensure power is available.

If good primary and secondary voltage is detected, disconnect all
low voltage wires (not including 24VAC secondary side of
transformer) from the control module (make sure there no
load/current through any monitoring / connected CTs).

If screen is still blank, replace board.

If screen illuminates and displays "FAN OFF", there is an
issue with low voltage wiring.
 Check unit display. Display should show "FAN OFF" or
temperature screen.

If screen is blank, check 2A fuse.
 If screen displays the "FAN OFF" screen, unit is not being told to
turn on.

Verify field low voltage wiring is correct
o CT or R & W
 If screen displays temperature screen, compare the OUT and DT, if
ST > DT, this Make-Up Air unit will not engage the electric
elements.
 Check the "message" LED. If blinking, see section labeled Start
Up Inspection & Observations – Message Center for further
instruction.

Manual reset limit may be open.

Manual reset limit switch located in control box.

Remember the heating is locked out when entering air temperature
is greater than 55°F (12.7°C). This cannot be bypassed.
 Clean the filter (lack of airflow will cause the unit to reduce its
heating output).
 Check the "message" LED. If blinking, see section labeled Start
Up Inspection & Observations – Message Center for further
instruction.
 Verify correct system setup which includes but is not limited to the
below:

SET POINT DIAL/HI LO Jumper

CONFIGURATION DIAL
 See the Setup and Programming Instructions for further setup
details
 Check source amp draw to verify all elements are working correctly
 See section labeled Start Up Inspection & Observations –
Message Center for further instruction.
24
Solution
EI915