Why is my Senztek Controller pump not running, even though it's sunny and the pump light is ON?
The pump may not be running due to several reasons. First, check if the pump has become unplugged. If not, wait one minute to see if the pump restarts. If it doesn't, test the controller pump outlet for power. If there is power, the pump needs to be replaced. If there's no power, the controller needs to be replaced.
What to do if the Sensor O.K. light is OFF on my Senztek Controller?
If the Sensor O.K. light is off, the roof sensor may not be detected. Check that the sensor is plugged in. Try plugging in a spare roof sensor to test. If the test sensor works, then replace the original roof sensor.
What does it mean if my Senztek Controller pump only comes ON for a few seconds every few minutes?
This is normal operation for Advanced Topout and Recovery. This prevents banging in the tank (steam implosions).
Why does my Senztek SolaSmart Plus pump only come ON when the Roof sensor is above 100ºC?
This is normal operation for Advanced Topout.
How to troubleshoot a Senztek SolaSmart Plus Controller with no operation and no lights ON?
If there is no operation and no lights are on, check the mains outlet. Then, press the pump button. If the pump light comes on, the controller is okay.
What to do if Senztek Controller pump is not running, while sunny outside and pump light is OFF?
The pump may not be running because the system is in Topout or there's a sensor mounting problem. Check the display to see if the system is in Topout, which is normal. Also, check the sensor readings. If the readings do not match the actual water/plumbing temperatures, ensure the sensor makes good contact with the pocket/surface, thermal paste might be needed to ensure good thermal conductivity.
Why is my Senztek Controller HWC light staying on too long?
The HWC light may stay on for an extended period due to excess water draw off or a leak, the HWC power not getting to the controller or element, or the element being open circuit (blown). Verify excess hot water is not being drawn off. If the tank temperature at the controlling sensor is less than 50ºC, the issue may be interrupted power or a faulty element. If it's greater than 50ºC, the issue may be the tank thermostat. Ensure the thermostat is turned up to max; if this doesn’t work, the thermostat is too inaccurate for this application.
What to do if my Senztek SolaSmart Plus pump is running continuously?
If the pump sounds like stones are passing through it, the pump may be cavitating. Long pump times may be normal for a variable speed pump or a special installation. Unplug the pump for 1 minute. If the system behaves normally after plugging it back in, then an airlock was present. If return pipe temperature losses are greater than the ‘pump off’ value, the system may lock on for extended periods. Insulate the return pipe better or change the pump off value.
What to do if Senztek SolaSmart Plus hot water stored drops significantly at night?
Significant drops in stored hot water at night, even without much use, can occur because the system is reverse thermo-siphoning, located in a high frost area, or the tank is losing heat. The non-return method may not be effective or is malfunctioning, potentially linked to nighttime pump activity. Check the roof sensor reading at night to verify this. Install better insulation on the hot water tank.
Status indicators for controller operation and sensor connectivity on the display panel.
Explains the function of the +/-, ENTER buttons for comfort level and boost operations.
The 3 sensor temperatures (Roof, Tank, Inlet) cycle on the display.
NEXT button cycles through additional screens like time and diagnostics.
Warns about no user-serviceable parts and dangerous voltages inside the enclosure.
Pump activates when collector is hotter than the tank by a set level.
Protects system from freezing by activating pump to slightly warm water.
Manages tank temperature limits, including 'Simple' and 'Advanced' options.
Periodically sterilises collector pipes and tank using elements to prevent bacterial growth.
A one-off operation to temporarily increase the hot water target temperature.
Allows controller setup to minimise electricity costs by matching hot water use to time bands.
User control for balancing efficiency vs. guaranteed hot water storage.
Setting Comfort to 0% disables electric element heating except for BioSafe sterilisation.
Scrolling display of Roof, Tank, and Inlet temperatures with indicator dots.
Access advanced diagnostics screens by pressing the NEXT button.
Shows the speed of the variable speed pump (0 to 100%).
Time is shown in HH:MM format.
Explains segments displaying active solar rule, HWC rule, active element, and tariff band.
Step-by-step guide to set the current time using ENTER and NEXT buttons.
Step-by-step guide to select and set the hot water profile (e.g., H1, H2, H3).
Troubleshooting steps for when the controller shows no activity or lights.
Diagnosing problems when the Sensor OK light is OFF or flashing.
Addressing issues like pump not running, running continuously, or intermittent operation.
Troubleshooting HWC light staying on too long or element-related faults.
General| Maximum Input Voltage | 100V |
|---|---|
| Battery Voltage | 12V/24V Auto |
| Operating Temperature | -20°C to +55°C |
| Input Voltage | 12V/24V |
| Output Voltage | 12V/24V |
| Certifications | CE, RoHS |
| MPPT Efficiency | 99% |
| Humidity Range | 10% to 90% (Non-condensing) |
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