mrcool 13seer r410 cond install manual 4web

Unitary Ducted Split AC & HP
30
9.4 Error Analysis
COOLING ONLY
DEMAND CONTROL BOARD DIAGNOSTICS
The state (Off, On, Flashing) of two LEDs on the control board (DS1 [Red] and DS2 [Red]) indicate
diagnostics conditions that are described in table 12. See table 12 to determine control board
operational conditions and to diagnose cause and solution to problems.
Table 12. Demand Control board Diagnostic LEDs
DS1 Red DS2 Red Trouble Case
Origin of
Trouble
Measure
OFF OFF
Power
problem
No power
(24V) to
demand
control board
terminals
R and C
or demand
control board
failure.
1 Check control transformer power
(24V).
2 If power is available to demand
control board and LED(s) do not
light, replace control board.
FAULT and LOCKOUT CODES (Each fault adds 1 strike to that code’s counter; 3 strikes per 30
minutes = LOCKOUT)
0.5s
Circulating
Flash
OFF
Actuation of
high pressure
switch
High pressure
switch
Abnormality is detected when the
contact of the high pressure switch
opens for 3 sec. The system will
be shut down. The unit will report
this fault. For the rst two faults
within 30 minutes, the unit can be
recovered automatically. If over
three times, the unit cannot be
recovered automatically.
OFF
0.5s
Circulating
ash
Actuation of
low pressure
switch
Low pressure
switch
When the unit runs more than 4
minutes or does not run, the low
pressure switch opens for more
than3sec and the system will be
shut down..The unit will report
this fault. For the rst two faults
within 30 minutes, the unit can be
recovered automatically. If over
three times, the unit cannot be
recovered automatically.
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