EcoSmart ES50HVP Service Manual - Insufficient Or No Heat
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External pump does not run (electrical issue)
Two types of pumps can be used with the ecosmart: standard 120VAC pumps or variable speed
pumps with a 0-10V control voltage input.
1. Jumper R to W (3) or set to test mode – Options DIP switch 6 on
2. Relay (14) will click on and 120VAC should appear on power connector (2)
3. 10VDC should also appear on 0-10V output (4) for variable pump operation
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. Install air eliminating
device at high point in system.
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 is required. Inspect expansion tank for defects. If the system does not have an
expansion tank, install one.
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
• Water heater dip tube is restricted or damaged; check and/or replace
• Supply water temperature set too low or not calibrated properly - check water
temperature
• 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
Cold water at hot faucet
When the heat source is a water heater, the most probable cause is reverse flow through the
heating loop from a stuck check valve - repair or replace valve.