Manual

18
On the third consecutive occurrence of the above mes-
sage (without a successful heating cycle in between) the
panel will display:
, , or
Spa is shut down and will not reset in 15 minutes. Press any
button to reset manually.
THE PANEL DISPLAYS:
, , or
This indicates that the temperature is completely
unknown because the pump has not yet run for 2 minutes
after Priming Mode was exited. This is only displayed for 2
minutes at power-up.
SOME TROUBLESHOOTING SCENARIOS
You find out the system is in “OHH.” This alone doesn't
explain a lot. What led up to the “OHH” is much more
important. If it's a Prestige, review the fault log carefully.
Otherwise, see if the user has any additional information (for
example, how long before the “OHH” was the spa panel last
checked, and how hot was the water then). If the spa has
cooled, see whether the problem can happen again, this time
watching carefully to see if there are additional clues leading
to the “OHH” (for example, other messages that appear
shortly before the “OHH” happens).
You find out the system keeps showing “HFL,” or is now
in “LF,” or is shut down due to a "dry" fault. Put the spa in
test mode with the light on, so that you see the two sensor
temperatures. Are they normal (within 1°F/0.5°C) when
not heating? How far apart are they when heating? “HFL”
happens when they are 6°F/3°C apart (4°F/2°C on 120V
and other low-heater-wattage systems), see how quickly
that happens after heating starts. If it's getting close to that
right away, it's probably a consistent flow problem, but if it's
nowhere close to the “HFL”-causing temperature difference,
the flow problem may be intermittent or only occur in certain
specific situations.
NOTE: This auxiliary freeze protection functions at all times,
even when another fault condition has occurred and has
otherwise shut the spa down.
Any time the lower of the two temperature sensors
goes below 45°F, all pumps/blowers turn on. They continue
to run for 4 minutes after the temperature reaches 45°F
or above. As soon as the temperature falls below 45°F
again, this process restarts. This “simplified” sensor freeze
protection functions at all times, even when another fault
condition (other than total sensor failure) has occurred and
has otherwise shut the spa down.
THE PANEL DISPLAYS:
, , or
This indicates that a substantial difference in
temperature between sensors has been detected
during heating.
This could indicate a flow problem. Check water level in spa.
Refill, if necessary. If the water level is okay, make sure the
pumps have been primed. On the fifth occurrence of
the above message the panel will display:
, or
This indicates a persistent flow problem. The heater
is shut down while all other spa functions continue to run
normally. Power on the spa must be cycled before the heater
will function again.
THE PANEL DISPLAYS:
, , or
This indicates that there is not enough water in the
heater. Spa shuts down for 15 minutes.
This could indicate poor flow or air bubbles in the heater.
Diagnosing M7 Topside Control Panels (cont.)