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Faults
Operation lamp
Fault lamp
The operating indicator is indicating that the heat pump is
ready for operation.
The TERRA CL heat pump is fitted with various safety de
-
vices so that no damage can be caused to the equipment
in the event of faults.
If the heat pump does not run as anticipated, please
check the following:
1. Is the green indicator light on the outside of the
switch cabinet on?
If not, check the following points:
a) Is the main switch switched on in the electrical
panel?
b) Is the control activation (green switch in the elec-
trical panel) switched on?
c) Is the fuse in the heat pump electrical panel OK?
d) Is the fuse in the main distribution board OK?
2. Is the red fault indicator light on the control panel
on?
Check the error messages on the control panel.
3. Is the heating control displaying an error message?
For more information, please see the control opera-
ting instructions.
4. Is the defrost control displaying an error message?
See the following points.
If an error occurs several times in succession, please call your relevant customer service.
Supplier telephone: _______________________________________
The following error messages may be displayed on the
defrost regulator display:
AL1 low pressure fault
Insufficient heat supplied.
Check whether the inlet opening or the evaporator pa-
•
ckage is contaminated or the air inlet or outlet is unobs-
tructed.
Air source heat exchanger (evaporator) is heavily iced
•
over – please contact your service technician
Fan speed is too low – please contact your service
•
technician
Fault-free functioning is not possible as the outside
•
temperature is too low (< -15°C).
A loss of refrigerant means that operation is not possib-
•
le – please contact your service technician.
AL2 high-pressure fault
Heat intake is too low.
Is the intake or return restricted or blocked?
•
Heating circulation pump function is not correct.
•
Check whether the circulation pump is running at the
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maximum speed level (level 3). If not, please contact
your service technician
Maximum temperature set is too high – please contact
•
your service technician.
Condenser plate heat exchanger in the heat pump is
•
blocked with dirt. Please contact your service technici-
an.
AL3 starting current limiter fault
An error in the primary circuit causes the fault.
In the main distribution board, check the fuses for the
•
heat pump. Please contact your service technician or
electrician.
AL4 fan fault
Fan is not running despite being triggered.
Check whether the fan is not blocked for any reason. Or
•
heavy ice formation on the evaporator.
Check the power supply, or have your electrician check
•
it.
ER1, ER2, ER3, ER22, ER30 sensor fault
One or more sensors is faulty. Please contact your service
technician.