LEED Smart Aquastat Control 32 Troubleshooting Guide

Table of Contents


LED Legend

GREEN LED: will blink 3 times when first plugged in to indicate the unit is functioning correctly
GREEN LED: will blink once every second for 30 seconds after first being powered on to indicate the device is in provisioning mode.
GREEN LED: solid on when a “Smart Timer” is active and the pump is not running
GREEN LED: will blink every 10 seconds when no other LED is lit  (e.g. no timer active, pump not running)
RED LED: fast blinking indicates that the temperature sensor is not connected properly
RED LED: slow shallow breathing when the pump is running whether due to a timer or due to demand.
BLUE LED: solid on when connected via the smartphone app.
PURPLE LED: slow deep breathing when connected to the smart phone app via WiFi.

1. SYMPTOM: Red LED flashes quickly after it is plugged in and never stops.

ISSUE: The LEED Smart Aquastat Control 32 is not able to get temperature information from the temperature sensor.

RESOLUTION: Unplug the LEED Smart Aquastat Control 32 from the wall, disconnect the temperature sensor connector at the coupler and disconnect the coupler from the wiring harness. Inspect the pins in the coupler and ensure they are not pushed to one side or the other. If they are you can straighten them with a small screwdriver or pen knife. If they are not visibly bent then it can help to wiggle the RJ-14 connectors as you insert them to ensure the pins drop into the slot in the connector and make solid contact. Reconnect the temperature sensor ensuring it snaps firmly into the connector. Plug the LEED Smart Aquastat Control 32 back into the wall outlet.

2. SYMPTOM: Pump won’t turn on when hot water is drawn from a faucet.

ISSUE 1: If the temperature of the water at the temperature sensor is greater than the low temperature value configured in Settings→Temperature Range the pump won’t turn on when flow is detected.

RESOLUTION 1: Open the smartphone app and go to the menu and select “Live Data”TM. If the temperature is above the configured high-temperature value, wait until the temperature drops below the configured low-temperature value or increase the low-temperature value via the smartphone app and test it again. If the temperature is below the configured low temperature value see ISSUE 2.

ISSUE 2: The Settings → Sensitivity value is set too high for the controller to detect the flow provided by the faucet.

RESOLUTION 2: Open the smartphone app and go to the menu and select “Live Data”TM. This will show what flow value the controller is sensing. Turn the hot water faucet fully on and watch the flow value. If it goes greater than 20 then the pump will turn on. If it doesn’t go greater than 20 then you will need to reduce the sensitivity value to be less than the maximum value you observed. 

NOTE: If you are seeing very low flow at the faucet it is possible the aerator in the faucet is clogged. Removing it and tapping it to remove any accumulated sediment can restore the flow, but they are inexpensive so replacing it is recommended.

3. SYMPTOM: The pump continues to run even though the piping feels hot.

ISSUE: The controller isn’t sensing a temperature greater than the configured high temperature.

RESOLUTION 1: Ensure that the temperature sensor is securely connected to the copper piping on the return line, covered with pipe insulation and is connected to the piping before it T’s into the cold water feed into the water heater. If it is loose, re-secure it in place with electrical tape, cover it with insulation and test it again. If it continues to run see RESOLUTION 2.

RESOLUTION 2: Open the smartphone app and go to the menu and select “Live Data”TM. It will display the temperature value. If this value is less than the high-temperature setting configured in Settings → Temperature Range (default 105°F) then the pump won’t turn off. Adjust the Temperature Range values down so that the high value is less than the observed value and the pump will turn off.

4. SYMPTOM: The pump turns on when no hot water is being drawn.

ISSUE: Pressure spikes in the cold water supply line caused by abrupt turning on or off of the cold water (for instance when a toilet fills or a sprinkler system turns on or by fluctuations in the feed from the utility company) can cause the LEED Smart Aquastat Control 32 to trigger the hot water recirculation pump to turn on.

RESOLUTION: The sensitivity value of the LEED Smart Aquastat Control 32 is too low and should be adjusted higher. The default value of 20 works well, but can be susceptible to these false triggers. It is recommended to increase it by 5 pulses at a time to filter out these anomalies.

5. SYMPTOM: No flow is seen on the “Live Data”TM screen when a faucet is opened.

ISSUE 1: A wire connecting the flow meter is broken.

RESOLUTION: Inspect the wiring harness where it connects to the flow meter to ensure none of the three wires appear broken. If they are contact Leridian Dynamics to get a replacement harness. If it looks good see ISSUE 2.

ISSUE 2: Sediment or scale is blocking the flow meter.

RESOLUTION: To ensure that this is indeed the issue perform the following test. Remove the sensor from the flow meter that is held on with 2 small silver screws (don’t worry, it won’t leak water when the sensor is removed).

Start the smartphone app, view the “Live Data” screen, and quickly wave a magnet back and forth over the sensor in the direction indicated in the picture. You should see the flow value change.

The flow meter works by spinning a magnet on a turbine that is read by the sensor. If you see a flow value in the smartphone app, the flow meter is blocked with sediment or scale and needs to be removed and cleaned. This can be difficult to perform properly so even if you don’t see flow on the app, baring an obvious problem with the wiring harness, this is the recommended action to take. Here is a short video of the test being performed.