Specifications

COMMISSIONING
51
DIAGNOSTIC FEATURES OF THE SOLAR CONTROLLER
A solar monitor is located on the side of the solar control unit and houses both a green and a red LED.
The green LED, marked “Solar”, indicates the current operational mode of the solar water heater and the red
LED, marked “Attention”, may indicate a potential fault mode.
The green LED will emit either a constant glow, a constant
pulsing or a series of flashes, with a 2 second interval
between each series.
The red LED will emit either a constant glow, a constant
pulsing or a series of flashes with a 2 second interval
between each series. A constant glow or pulsing does not
necessarily mean there is a fault with the system. A series of
flashes indicates there may be a particular fault condition with
the system.
The modes are:
Flashes
Operational Modes
Flashes
Indicator or Fault Modes
solid green
(remains on)
Standby mode
solid red
(remains on)
Hot sensor temperature
greater than 130°C
green
slow pulse
Standby mode
(power on for less than 48 hours)
red
rapid pulse
Temperature rise across collector
greater than 45°C
(circulator at full speed)
green
rapid pulse
Circulating water through collector(s)
3 x red
Hot sensor in collector – short circuit
3 x green
Circulating water through collector(s)
(power on for less than 48 hours)
4 x red
Hot sensor in collector – open circuit
no green
(remains off)
Power outage or call for service
5 x red
Cold sensor –short circuit
6 x red
Cold sensor – open circuit
If the power supply to the solar control unit is on and the green LED is off or 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. A constant glow or pulsing of the red LED does not necessarily mean there is a fault with
the system.
Note: During periods of high solar radiation and if the circulator activates after having been off, such as
during start up if the solar collector(s) have not been covered, it is possible the red LED may emit a rapid
pulse for a period of up to ten (10) minutes. This does not indicate a fault. Refer to “Solar Controller
Operation at Start-Up” on page 50 for the possible green and red LED pulsing sequence during start up
procedure.
If the red LED continues to emit a rapid pulse for longer than ten (10) minutes, or emits a series of flashes,
then count the number of flashes and phone Rheem Service or their nearest Accredited Service Agent to
arrange for an inspection.