23/25
55208033-08
SPECIFIC FAULT DIAGNOSIS FOR E UNITS
A fully electronic system comprising 600 E with MHPUE or DCUE communicates between the units by digital codes. Signals are transmitted every 10
seconds, therefore a delay of up to 10 seconds could occur before the system responds to a command. Similarly if the communication link is broken, the
outdoor unit will shut down within 15 seconds. To reset: Switch the mains off to both indoor and outdoor units to reset the microprocessor; the current
programme is retained in the indoor pcb memory.
Check for alarms i.e.
i
Audible alarm or LEDs flashing - see table below
ii
If NO external connections are made to alarm terminal 5, the presence of an alarm condition can be checked for by testing continuity between L and
5; Alarm = 220ohms, Clear = open circuit. WARNING: All parts of the circuit are at high voltage, if any external connections are made to terminal 5,
the continuity meter will be damaged
The outdoor unit can be forced to operate for test purposes by temporarily linking live directly to terminal 3
(up to 20 seconds delay)
L
Outdoor unit runs
Charge link JP6 still fitted
Remove JP6 charge link
continually at high speed
MHPUE in heating
Normal
Minimum speed adjustment set too high
Reset minimum speed
If all external devices appear O.K. the pcb may need to be replaced
M
No LED's lit or flashing
No mains supply or internal fuse blown
Check electrical supply and fuses
Fan motor plug disconnected
Reconnect fan motor plug
Motor internal thermal protector operated
Check motor and rectify
Ribbon cable to fascia not connected Reconnect
Receiver pcb fault
Check circuit board and replace
N
Regular audible pulsed signal -
all LED's lit
Indoor temperature sensor problem
Disconnect data link to identify which unit, if fault
clears it is outdoor unit
Outdoor sensor problem
Replace outdoor unit sensor
O
Indoor unit continues after stop/off
command
Overrun of 30 seconds in heating
NORMAL
P
Unit will not respond to infrared
commands.
No audible answer signal
Handset not plugged into wall bracket (if
appropriate). Fault in connections between wall
bracket and indoor unit
Plug in correctly and check connections
Battery discharged
Replace battery
Operating in charge mode
Remove charge link from outdoor unit
Q
Unit answers infrared commands
with double audible signal
Communications not yet established. Wait 2 minutes
from power up
If electric heater is known to be fitted, double signal
indicates open circuit element or thermal protector
Demanded mode not available
Double signal in response to on/off command
indicates under time control
R
Sounder beeps and LED(s) flash 0.5s
ON, 0.5s OFF
Warning of alarm status
See table below
S
All LED's lit and continuous audible
signal
Microprocessor fault
Replace indoor unit pcb assembly
T
Short cycles between cool and heat
System oversized for room
Use cool or heat programmes NOT 'Auto' and set to
lower speed
HANDSET
If the handset fails to respond to button operations, disconnect and then reconnect the battery.
The previous programme state is retained in the memory.
LED STATUS AND ALARM INDICATIONS
Status display
LED
Flash Rate
ON/OFF
(seconds)
Sounder
Condition
Status
Red
Amber
Green
C
ON
OFF
In
Operation
Normal
C
F
ON
OFF
Heating
Demand
Normal
C
D
ON OFF
Cooling
Demand
Normal
C
0.5 / 5.0
OFF
Standby
Normal
C
0.5 / 15
OFF
Clock Controlled Standby
Normal
C
2 x 0.5 / 15
OFF
Setback
Normal
C
0.5 / 0.5
OFF
Filter Clean Advisable
Normal
Alarm indications
F
0.5 / 0.5
BEEPS Network Warning
Call Engineer
D
0.5 / 0.5
BEEPS High Condensate Level
Call Engineer
C
F
0.5 / 0.5
BEEPS Low Pressure Warning
Call Engineer
C
D
0.5 / 0.5
BEEPS High Pressure Warning
Call Engineer
C
F
D
0.5 / 0.5
BEEPS
Contactor Overload
Operated
Call Engineer
F
D
0.5 / 0.5
BEEPS Outdoor Fan Fail
Call Engineer
C
F
D
ON
BEEPS Sensor Fault
Call Engineer
Heronhill - for all your Marstair requirements
Tel: 01823 665660
www.heronhill.co.uk
Fax: 018123 665807
