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P a g e
TROUBLESHOOTING
Thermostat call error
If the ecosmart does not run when the thermostat is calling, jumper R to W for heating, or R to
Y (Y2) to verify if the problem is with the thermostat or ecosmart control. Note that some
thermostats have a delay (typically five minutes) before they will re-start cooling.
External pump does not run
In areas where hard water is present the pump may stick and fail to run. Often, closing the
isolation valve on the return leg and opening the drain port so that water flows through the
pump can free this. If this fails to free the pump, removal for cleaning or replacement is
necessary. The daily pump exerciser will help prevent pump sticking.
External pump is noisy at start-up
If sound has not diminished within 1 minute, air may be present in the system and may need re-
purging. If the heat source is a water heater, check to make sure branch connections for the
heating loop are horizontal to prevent the collecting of air in the loop.
Water heater temperature and pressure relief valve is weeping
A check valve or back-flow preventer may have been installed in the system. Some form of
pressure relief may be required. Consult water heater manufacturer’s instructions. An
expansion tank may be required.
Insufficient or no heat
Check that the heat generator is functioning properly.
Plugged air filter or coil. Refer to maintenance section for filter care and coil cleaning.
Air in heating loop - purge system.
Inlet and outlet connections to ecosmart are backwards - reverse connections.
Supply water temperature set too low or heat generator is not supplying water at the
specified setting.
Restrictions on heating loop - remove restrictions, check if valve is stuck, isolation valves
could be too restrictive or left partially closed after purging, or a closed valve.