Heat Controller SMA Service Manual page 43

over current protection of the compressor occurs 4 times
Indoor room thermister is open or shorted
Indoor evaporator thermister is open or shorted
Outdoor condenser temperature thermister is open or shorted
(without for cooling only models)
outdoor unit protects (outdoor temp thermister,phase order ect.)
EEROM error
Indoor unit communication error
no voltage outdoor transformer
UNPLUGGED (S) WIRE ( LOCK OUT 3‐5 MINUTES)
Flash at 5Hz
AUTO TIMER PRE‐DEF. OPERATION
AUTO PRE‐DEF. OPERATION TIMER
OVER CURRENT ‐ CHECK VOLTAGE ‐ LOW VOLTAGE ‐ HIGH AMPS
VOLTAGE SHOULD BE BETWEEN 175 ‐ 253 V OLTS
OUTDOOR UNIT PROTECTS ‐ CHECK POWER SUPPLY
COULD BE THE OUTDOOR PCB OR THE COMPRESSOR ON LOCKED ROTOR
COMMUNICATION ERROR ‐ L1 & 2N REVERSED from the indoor to the outdoor
AUTO (GREEN LED ) FLASHES AT THE EVAP. & (RED
TIMES IN THE OUTDOOR UNIT. IT TAKES 2‐3 MINUTES FOR THE
UNIT TO REACT AND START FLASHING
WHEN THE POWER IS APPLIED TO THE OUTDOOR UNIT THE RED
TURNS SOLID RED IF THE (S) WIRE IS DISCONECTED OR ANY FAULTS WITH THE
EVAPORATOR THE RED LED FROM THE OUTDOOR UNIT FLASHES FIVE TIMES
OUTDOOR UNIT TRANSFORMER VOLTAGE 230 TO 12 V AC
VOLTAGE FROM 2(N) TO (S ) TO THE EVAPORATOR 12 VOLT DC
NO 12 VOLTAGE FROM THE TRANSFORMER 2(N) TO (S) YOU GET 32 V DC
FROM 2(N) TO (S) AND THE AUTO GREEN LED FLASHES AFTER 2‐3 MINITES
THE OUTPUT VOLTAGE WILL VARY DEPENDING ON THE INCOMING VOLTAGE
SMA /SMH 18 ‐24 DIAGNOSTICS
X OFF
SMA‐SMH‐18‐24 SA
SMA‐SMH 18‐24 SB
8.8
.
Operation
LED
X
X
X
X
X
X
X
Outdoor led should be solid
LED) FLASHES FIVE
LED
Timer Defrost auto
LED LED LED
X X
X X X
X X
X
X
X X
X X
X X
RED for normal operation
Outdoor Unit Diagnostic
Flashes Failure Mode
5 Communication Failure
2 Condensor Temperature Sensor
1 Other Indoor Failure
Outdoor
LED
(RED)
OFF