Manual
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Green LED is not on, Determine if both R and C module terminals are
module does not power up connected. Verify voltage is present at module's R and
C terminals. Review 24VAC Power Wiring (page 4) for
R and C wiring.
Green LED intermittent, Determine if R and Y terminals are wired in reverse.
module powers up only Verify module's R and C terminals have a constant
when compressor runs source. Review 24VAC Power W iring (page 4) for R
and C wiring.
TRIP LED is on but system Verify Y terminal is connected to 24VAC at contactor
and compressor check OK coil. Verify voltage at contactor coil falls below 0.5VAC
when off.
TRIP LED and ALERT LED Verify R and C terminals are supplied with 19-28VAC.
flashing together
ALERT Flash Code 3 Verify Y terminal is connected to 24VAC at contactor coil.
(Compressor Short Cycling) Verify voltage at contactor coil falls below 0.5VAC when
displayed incorrectly off.
ALERT Flash Code 5, 6 or 7 Check that compressor run and start wires are through
(Open Circuit, Open Start Circuit module's current sensing holes. Verify Y terminal is
or Open Run Circuit) displayed connected to 24VAC at contactor coil. Verify voltage at
incorrectly contactor coil falls below 0.5VAC when off.
ALERT Flash Code 6 (Open Check that compressor run and start wires are routed
Start Circuit) displayed for Code 7 through the correct module sensing holes.
(Open Run Circuit) or vice versa
ALERT Flash Code 8
(Welded Contactor)
displayed incorrectly
Determine if module's Y terminal is connected. Verify Y
terminal is connected to 24VAC at contactor coil. Verify
24VAC is present across Y and C when thermostat demand
signal is present. If not, R and C are reverse wired. V erify
voltage at contactor coil falls below 0.5VAC when off.
Table 2. Module Wiring Troubleshooting
To set the cycle timer, place the timing pin on
the defrost control board to the desired time
interval post.
Note: All units are shipped from the factory with
the default time setting of 30 minutes. Maximum
heating performance can be achieved by setting
the time to 90 minutes.
Defrost Test Procedure
1. Terminals"R'-'C" must have 18-30v present
between them in order for time delay and
defrost sequences to be initiated.
2. With compressor running in heat mode,
first jump the "T2"-'DFT" test pins. This
will indicate to board that defrost T-stat is
closed. Defrost T-stat closes at 32 °, opens
at 68°.
3. Next jump the "Test" pin to "C" on terminal
strip.This will initiate defrost test in 5, 10 or
15 seconds (This is determined by 30, 60
or 90 minutes defrost pin settings). Factory
setting will be 30 minutes.
4. When the reversing valve shifts to the
defrost mode, quickly remove jumper from
"Test'-'C'. If the jumper is not removed
within a 5 second period, the defrost test
will terminate. Unit will continue to stay in
defrost mode Until :
A) Board recognizes that defrost
sensor has reached 68° and
opened or
B) "T2"-'DFT'jumper is removed or
C) 10 minutes have elapsed (board
override)
Ifthe above steps will not initiate a defrost, replace
the defrost board.
Anti Short Cycle Timer Test
The 5 minute time delay featu re can be bypassed
or shortened to 1 second by jumping the "Test"
to "C" terminal.
Note: If jumper is left on the "Test" to "common"
pins permanently, the defrost cycle will become
inoperable.
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