6 720 643 259 (2010/05)
Troubleshooting
|
47
US/CA
Fault 49
Temperature sensor TD on external heat
exchanger defective
119
Short circuit on the sensor
lead (TD).
Check temperature sensor
(TD) and replace if necessary.
120
Break in sensor lead (TD).
Fault 50
Solar pump seized or air in system
121
126
140
Solar pump (SP, PA or PC)
sticking due to physical
blockage.
Unscrew and remove the
slotted screw on the pump
head and use a screwdriver to
release the pump shaft. Do
NOT strike the pump shaft with
the screwdriver.
Air in solar thermal system.
Bleed solar system and top up
with heat transfer fluid if
necessary.
143
Secondary circuit pump (PD)
sticking due to physical
blockage.
Unscrew and remove the
slotted screw on the pump
head and use a screwdriver to
release the pump shaft. Do
NOT strike the pump shaft with
the screwdriver.
Fault 51
Incorrect temperature sensor type
connected
122
Collector temperature sensor
type used as tank temperature
sensor (T
2
).
Use correct type of
temperature sensor.
Æ
Technical data in ISM
installation instructions.
123
Tank temperature sensor type
used as collector temperature
sensor (T
1
).
127
Tank temperature sensor type
used as collector temperature
sensor (TA).
132
Temperature sensor type PTC
1000 used as tank temperature
sensor (T
2
).
133
Temperature sensor type PTC
1000 used as collector
temperature sensor (T
1
).
Display (
Æ
Item 1, 3 and 4 in fig. 15
Text
Code Cause
Remedy (by installer)
