Rheem 511161 Owner's Manual And Installation Instructions page 9

SOLAR MONITOR
A solar monitor is located on the side of the solar control unit and houses 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 two (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 two (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
solid green
Standby mode
(remains on)
green Standby mode
slow pulse (power on for less than 48 hours)
green
Circulating water through collectors
rapid pulse
Circulating water through collectors
3 x green
(power on for less than 48 hours)
no green
Power outage or call for service
(remains off)
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 (3) to six (6) 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.
Notes:

If the system is in standby mode with the green LED emitting either a constant glow or slow pulsing flashes
(circulator is off) and the solar storage tank is full of hot water, the red LED may simultaneously emit a
constant glow if solar radiation is still being received by the solar collectors. This does not indicate a fault.
The red LED will go out when the temperature in the solar collectors decreases.

During periods of high solar radiation and the circulator activates after having been off (the green LED will
emit either a rapid pulse or a series of three flashes), it is possible the red LED may simultaneously emit
a rapid pulse for a period of up to ten (10) minutes. This does not indicate a fault.
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.
ABOUT YOUR WATER HEATER
Flashes Indicator or Fault Modes
solid red Hot sensor temperature
(remains on) greater than 130°C
Temperature rise across collector
red
greater than 45°C
rapid pulse
(circulator at full speed)
Hot sensor in collector – short circuit
3 x red
Hot sensor in collector – open circuit
4 x red
Cold sensor –short circuit
5 x red
Cold sensor – open circuit
6 x red
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