22
GREEN LED IS NOT ILLUMINATED ON SOLAR MONITOR
Check the power outlet for the solar control unit is switched on.
If the power outlet for the solar control unit is switched on, switch off for a few seconds and then switch on
again. If the green LED remains off there may be a fault with the water heater. Phone your nearest Solahart
Dealer to arrange for an inspection.
RED LED ILLUMINATED ON SOLAR MONITOR
The illumination of the red LED does not necessarily mean there is a fault with the system. A constant glow
or rapid pulsing of the red LED indicates an operational mode of the water heater.
Constant Glow
When the water heater has entered Over-temperature operation, the water in the solar collectors will
continue to gain heat whilst solar energy is still available. The red LED will commence to emit a constant
glow when sufficient solar energy has been received to activate the circulator. This indicates a build up in
temperature of the water in the solar collectors and does not represent a fault. The red LED will stop glowing
when the circulator has moved the excess energy from the solar collectors to the solar storage tank.
When eight Over-temperature cycles have been completed and if solar energy is still available, the red LED
will emit a constant glow until either a reasonable quantity of hot water is drawn from a tap or the water in the
solar collectors looses energy and cools as the available solar energy is reduced, such as when the sun
becomes lower in the sky in the late afternoon / early evening or the sky becomes very cloudy.
Refer to
on page 5.
Rapid Pulsing
During Normal operation the red LED will rapid pulse if the temperature difference between the hot sensor
and cold sensor is high due to excess heat in the solar collectors. This may not represent a fault. The rapid
pulsing of the red LED will cease as the water circulates transferring the excess heat from the solar
collectors to the solar storage tank and the temperature difference between the hot sensor and cold sensor
reduces. This should be within four (4) to five (5) minutes, but may take up to ten (10) minutes.
If the red LED continues to emit a rapid pulse for longer than ten (10) minutes, switch off the electrical supply
at the power outlet to the solar control unit for a few seconds, then switch on again. If the red LED continues
to emit a rapid pulse for longer than ten (10) minutes, phone your nearest Solahart Dealer to arrange for an
inspection.
Series of Flashes
If the red LED is flashing this indicates there may be a fault with the water heater. The red LED may emit
from three to six flashes in each series of flashes with a 2 second interval between each series.
If the red LED emits a series of flashes, switch off the electrical supply at the power outlet to the solar control
unit for a few seconds, then switch on again. If the red LED illuminates again, then count the number of
flashes and phone your nearest Solahart Dealer to arrange for an inspection.
CIRCULATOR OPERATES AT NIGHT
The circulator can operate during periods of no solar energy, usually at night, under two operational modes
of the water heater. This is by design and does not indicate a fault.
Freeze Protection operation:
The circulator will activate (green LED rapid pulse or 3 flashes) if the water
temperature in the solar collectors approaches freezing point. This occurs in very cold conditions, such as
overnight and very early in the morning before sunrise. The purpose of the Freeze Protection operation is to
prevent freezing of water in the solar collectors and solar pipe work. The circulator will remain on for at least
nearly seven (7) minutes and until the hot sensor measures a water temperature at a safe level above
freezing from the storage tank. This process will repeat whenever the water temperature in the solar
collectors approaches freezing point. Refer to
on page 5.
Night Time Cooling operation:
The circulator will activate (green LED rapid pulse or 3 flashes) if the water
heater has entered Over-temperature operation during that day. This can occur during periods of higher
solar energy or lower hot water usage. Excess solar energy gained will be dissipated through the solar
collectors until the water temperature in the solar storage tank decreases to a desired 60°C to 70°C. The
circulator may remain on for some time. Refer to
“Night Time Cooling operation”
on page 5.
