14
Startup Troubleshooting
PROBLEM
POSSIBLE CAUSE
SOLUTION
Temperature display not lit
Unit will not start
Check power supply to unit.
Check circuit breaker or fuses
Check 24 volt transformer
Turn on or reset breaker.
Check transformer/replace if
required.
Temperature display lit
Unit will not start.
Water flow less than the 20
gpm minimum required.
Time delay and anticycle
timers satisfied.
Temperature set too low.
Check that pump is on.
Check that water is flowing
through heater.
Check any bypass valves that
are installed.
Check filtering system.
Check pump and impeller.
Check that pressure switch is
closed. (needs 2 psi to close)
Wait at least 8 min. without
resetting on/ off switch or
breakers.
Set temperature setpoint above
water temperature.
Pool water does not reach
temperature setpoint.
Heater runs only when pool
timer is on.
Outside air temperature is low.
Turn on pool pump.
Install solar blanket on pool.
Water dripping from bottom
of unit.
Water vapor will condense on
the outside of the evaporator
coil during normal operation.
Leak at pipe connection
No action
. This is normal.
Repair as required.
For specific controller issues, please see Chapter 9 of the Viconics
HP727-S manual.
