User guide

18
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.
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 .5°C/1°F) when not
heating? How far apart are they when heating? “HFL”
happens when they are 3°C/6°F apart (2°C/4°F 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.
, 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.
On the third consecutive occurrence of the above message
(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.
Diagnosing M7 Topside Control Panels (cont.)