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Troubleshooting - Mechanical Systems
Problem Possible Cause Solution
Flashing O3 on Control Panel
Spas with or without Ozona-
tors
• Ozone working
• Irrelevant
• No Action required.
• Call customer care or service
800.876.0158.
“FLO”
Appears on Control Panel or
“FLO” ashes and alternates
with Temperature
• Pump(s) not running
• Water level low
• Pump Surging
• Dirty or Clogged
• See “Pump(s) will not Start.”
• Fill spa to correct level.
• See “Pump Surging” Section
above.
• Check lter installation Filters
Clean lter(s), page 18.
dr/dry
Inadequate water detected in
heater. (Displayed on 3rd oc-
currence of “dr” message) Spa
is shut down.
• Closed T-Valves
• Loss of prime
• Circulation Pump
Malfunction
• Dirty lters/old lters
• Open T-Valve by lifting handle
all the way up.
• Prime pump while pump is on
by loosing union.
• Call Thermospas for service
800.876.0158 to order a new
pump or to set up a service
appointment.
• Remove and clean lters or
replace with new ones.
OHH (Overheat)
The spa has shut down. One
of the sensors has detected
that the spa water is 110° F
(Approximately 43.3° C)
• Partially closed T-Valve
• Outside temperature
is at or around
110°F/43.3°C
• Dirty lters/old lters
• Lift T-Valve all the way up.
• Remove some hot water and
add cool water. Turn blower
on, this will cool water down,
then remove the cover.
• Remove and clean lters,
replace with new ones.
Breaker keeps tripping or will
not Reset
• Improperly wired ground
• Spa Controller needs
repair
• Spa Heater needs
repair
• Contact your electrician or
ThermoSpas 800.876.0158.
• Customer Care
Spa Leaks • Loose union , drain
valve open
• Leaking Barb Fitting
• Leaking Glue tting
• Check and tighten all unions,
close drain valve.
• Check hose to barb
connection. Clamp hose if
required, call Thermospas for
service 800.876.0158.
• Call ThermoSpas for service
800.876.0158.
Troubleshooting - Mechanical Systems
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