Senztek SolaStat-Plus - Page 32

SolaStat™-1-3 Installation Guide
Version 1.1 – April 2013 Page 29
Symptom Cause Solution
Display on, pump not
running, but sunny
outside. Pump light
OFF
 Roof sensor reads Hi on display
 Sensor not mounted properly
 Water not hot enough yet
 Normal Operation, pump disabled
 Check that th
e ROOF senor is
thermally bonded to the solar
panel outlet

Check the temperatures of the
ROOF and TANK. They need to
be higher than the difference
programmed for PUMP ON
(standard 12°C). Wait.
Pump runs at night
FROST light on
 Frost outside  Normal operation
Pump runs at night
No FROST light
showing
 System is reverse thermo-
siphoning
 The non-return valve is not fitted
correctly or is malfunctioning
Display on, pump will
not operate, but sunny
outside. Pump light
OFF; TOPOUT Light
on.
 Topout Temperature exceeded  If the TANK temperature is greater
than the programmed Topout
value (standard (80°
C) then the
system is working correctly.
‘Lo’ on Display
 Sensor below -20°C (-4°F)  Check outside temperature
‘Hi’ on Display
 Sensor above 159°C (318°F)  Check Collector has water in it
‘SSd’ on display.
ROOF light flashing
 Roof Sensor below -40°C (-40°F)
 Wire to Roof sensor broken.
 Roof Sensor damaged.
 Confirm “SSD’ was displayed for
more than 12 hours.

Push ‘PUMP’ button until a
temperature reading is displayed.
 Repair wire
 Replace Roof Sensor
‘SSd’ on display.
ROOF light ON
 Roof Sensor above 162°C (324°F)
 Wire to Roof sensor shorted.
 Roof Sensor damaged.
 Confirm “SSD’ was displayed for
more than 12 hours.

Push ‘PUMP’ button until a
temperature reading is displayed.
 Repair wire
 Replace Roof Sensor
‘SSd’ on display.
TANK light flashing.
 Wire to Tank sensor broken.
 Tank Sensor damaged.
 Repair wire
 Replace Tank Sensor
‘SSd’ on display.
TANK light is ON.
 Wire to Tank sensor shorted.
 Tank Sensor damaged.
 Repair wire
 Replace Tank Sensor
‘SSd’ on display.
INLET light flashing.
 Wire to Inlet sensor broken.
 Inlet Sensor damaged.
 Repair wire
 Replace Inlet Sensor
‘SSd’ on display.
INLET light is ON.
 Wire to Inlet sensor shorted.
 Inlet Sensor damaged.
 Repair wire
 Replace Inlet Sensor
Note: When power is removed, the internal timer will keep running for at least 7 days