Faults
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6 720 811 270 (2015/04)
AGS10-2, AGS10E-2, AGS20-2, AGS50-2
9
Faults
Information regarding faults can also be found in the installation instructions for the controllers.
Type of fault
Effect
Possible causes
Remedy
Pump not running although start conditions are met.
The solar cylinder is not being
heated by solar energy.
Pump is faulty.
Check the pump and replace if necessary.
Pump 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.
Pump is not responding to the controller.
See controller instruction manual.
Pump continually switching on and off.
Solar yield too low.
Difference between controller cut-in and cut-out temperatures
too small.
Check controller settings.
Volumetric flow rate too high.
Check and adjust the flow rate.
Temperature sensor position or contact is not correct.
Check temperature sensor position.
Pump does not switch off.
Heat is being transferred out of
the storage cylinder.
Temperature sensor faulty or in wrong position.
Check temperature sensor position, installation and
characteristics.
Controller faulty.
Notice: speed-controlled pumps do not switch off immediately, but
only once the lowest speed is reached.
DHW too hot.
Risk of scalding
Cylinder temperature limit and DHW mixer set too high.
Set the cylinder temperature limit and DHW mixer to a lower setting.
DHW mixer faulty
Check the DHW mixer and replace if necessary.
DHW too cold (or inadequate volume).
DHW thermostat on the boiler, on the heating controller or on
the DHW mixer set too low.
Set the temperature as instructed in the applicable operating
instructions (maximum 60 °C).
Check that backup heating is functioning properly.
Temperature differences in solar circuit are too high / flow temperature is too high / high collector temperature reached too quickly
Solar yield too low or system
damage.
Faulty temperature sensor or controller malfunction.
Check temperature sensor and settings of controller.
Air in the system.
Bleed or purge the system.
Volumetric flow rate too low.
Check/adjust the flow rate.
Blocked pipework.
Check/flush the pipework.
Collector arrays not hydraulically balanced.
Carry out hydraulic balancing.
Pressure drop in the system.
Solar yield too low.
Loss of heat transfer fluid at joints.
Braze any leaks. Replace seals. Retighten screw fittings.
Loss of heat transfer fluid through an open safety valve.
Check charge pressure and size of expansion vessel.
Vapour has escaped through open air vent (normal operating
function).
Close air vent after venting.
Frost damage.
Check frost protection.
No flow noticeable on flow rate indicator despite pump running.
Solar yield too low.
The shut-off devices are closed.
Open the shut-off devices.
Air in the system.
Bleed or purge the system.
Indicator element in the flow regulator is sticking.
Clean the flow regulator.
Noises in the collector array at high levels of solar exposure (vapour knocking).
Leakages in solar heating
circuit.
Even flow through the collector arrays is not possible.
Check piping.
Expansion vessel too small or faulty.
Check design and charge pressure of the expansion vessel and
check operating pressure.
Pump power is too low.
Check pump, replace if necessary.
The collector with the collector temperature sensor is under
shade.
Remove shade.
Flow and return swapped over.
Check pipework, replace if necessary.
Air in the system.
Bleed or purge the system and check slope of pipes.
Table 17