C A M B R I D G E T P 5 0 0
(24)
Heater-Related Messages
Heater Flow is Reduced (HFL) – MO16
There may not be enough water flow through the heater to
carry the heat away from the heating element. Heater start up
will begin again after about 1 min. See “Flow Related Checks”
below.
Heater Flow is Reduced (LF)* – MO17
There is not enough water flow through the heater to carry the
heat away from the heating element and the heater has
been disabled. See “Flow Related Checks” below. After the
problem has been resolved, you must press any button to reset
and begin heater start up.
Heater may be Dry (dr)* – MO28
Possible dry heater, or not enough water in the heater to start
it. The spa is shut down for 15 min. Press any button to
reset the heater start-up. See “Flow Related Checks” below.
Heater is Dry* – MO27
There is not enough water in the heater to start it. The spa is
shut down. After the problem has been resolved, you must
press any button to reset and restart heater start up. See “Flow
Related Checks” below.
Heater is too Hot (OHH)* – MO30
One of the water temp sensors has detected 118°f (47.8°C) in
the heater and the spa is shut down. You must press any
button to reset when water is below 108°f (42.2°C). See “Flow
Related Checks” below.
A Reset Message may Appear with other Messages.
Some errors may require power to be removed and restored.
Flow-Related Checks
Check for low water level, suction flow restrictions, closed
valves, trapped air, too many closed jets and pump prime.
On some systems even when spa is shut down, some
equipment may occasionally turn on to continue monitoring
temperature or if freeze protection is needed.
Sensor-Related Messages
Sensor Balance is Poor – MO15
The temperature sensors MAY be out of sync by or 3°F. Call for
Service.
Sensor Balance is Poor* – MO26
The temperature sensors ARE out of sync. The Sensor Balance
is Poor fault has been established for at least 1 hour.
Call for Service.
Sensor Failure – Sensor A: MO31, Sensor B: MO32
A temperature sensor or sensor circuit has failed. Call for
Service.
Miscellaneous Messages
No Communications
The control panel is not receiving communication from the
System. Call for Service.
Pre-Production Software
The Control System is operating with test software. Call for
Service.
°F or °C is replaced by °T
The Control System is in Test Mode. Call for Service.
* This message can be reset from the topside panel with any
button press.
