Subject to alterations Page 28 of 33
Fault finding
If problems arise during operation, please check the following before calling the service centre.
Check whether the alarm LED on the front of the CTS 602 control panel is flashing. If so, investi-
gate the cause of the alarm and remedy the fault. If necessary, contact your local service centre.
For details of alarms and how to reset them, please refer to the operating instructions for the CTS
602 controls.
- Compact S is operating but with reduced output.
Check that sufficient air is being supplied to Compact S. Check filters for excessive dirt ac-
cumulation. Check that valves are sufficiently open. In 98% of cases, the fault is caused by
clogged filters. If necessary, increase the ventilation step. Any dampers to the open air
should be shut at outdoor temperatures lower than 6°C.
- Compact S is operating but there is no hot water.
Check whether the tank has been emptied of hot water. If the system is equipped with a
circulation pump but the circulation circuit has not been insulated, considerable heat loss
may result, significantly reducing Compact S capacity.
Has the required water temperature (T12) been set correctly in the CTS controls? Usually,
water temperature should be set to between 45 and 55°C. Please refer to the CTS 602 op-
erating instructions for details on checking and setting water temperature.
Is the air supplied too cold or the quantity supplied too low? Check filters and valves. Check
whether duct insulation is sufficient and complete.
- Compact S is not operating.
Check whether a fuse has blown. Check whether the hot water safety thermostat has cut
out. If it has, press the button and the thermostat will cut in again once the water tempera-
ture has dropped 10-15°C. If the thermostat continues to cut out, contact your local service
centre.
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