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Troubleshooting | 91US/CA
Fault 44
Temperature sensor T5 at top of solar tank
defective
109 Short circuit on the sensor
lead (T
5
).
Check temperature sensor (T
5
)
and replace if necessary.
110 Break in sensor lead (T
5
).
Fault 45
Temperature sensor T6 at bottom of
supplementary tank defective
111 Short circuit on the sensor
lead (T
6
).
Check temperature sensor (T
6
)
and replace if necessary.
112 Break in sensor lead (T
6
).
Fault 46
Temperature sensor TA on collector field 2
defective
113 Short circuit on the sensor
lead (TA).
Check temperature sensor
(TA) and replace if necessary.
114 Break in sensor lead (TA).
Fault 47
Temperature sensor TB at top of tank B
defective
115 Short circuit on the sensor
lead (TB).
Check temperature sensor
(TB) and replace if necessary.
116 Break in sensor lead (TB).
Fault 48
Temperature sensor TC at bottom of tank C
defective
117 Short circuit on the sensor
lead (TC).
Check temperature sensor
(TC) and replace if necessary.
118 Break in sensor lead (TC).
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.
Display (Æ Item 1, 3 and 4 in fig. 29)
Text Code Cause Remedy (by installer)
91


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