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ULTRATEMP ETI™ Hybrid Heater Installation and User’s Guide
HIGH WATER
TEMP
Water temperature is above
104° F [40° C].
LOW WATER
TEMP
Water temperature is below
40° F [4.4° C].
LOW WATER
FLOW
The pressure switch sensing
water flow is open.
REMOTE
POOL/SPA
Pool and Spa relay remote inputs
are simultaneously energized.
WATER THERM
SHORT
Water temperature thermistor
circuit shorted.
WATER THERM
OPEN
Water temperature thermistor
circuit open.
SUCTION TH
SHORT
Defrost thermistor circuit shorted
SUCTION TH
OPEN
Defrost thermistor circuit open.
LOW AMBIENT
TEMP
Air temperature is too low for heat
pump operation
BROWNOUT
The 24 VAC supply voltage to the
control board is low.
HIGH REFRIG
Refrigerant high pressure switch
is open.
LOW REFRIG
Refrigerant low pressure switch
is open.
SERIAL COMM
FAULT
Control board has not received
a reply message for two (2)
minutes.
FIVE ALARMS
Indicates that five (5) faults have
occurred in one (1) hour. This
fault will automatically reset in
one (1) hour or can be manually
reset by pressing the ON/OFF
button.
Control Panel Alarm Messages
HI LIMIT
SWITCH
Water temperature is above
127° F [52.8° C].
AGS LIMIT
Water temperature is above
140° F [60° C].
THERM FUSE
OPEN
Thermal fuse circuit is open.
AIR FLOW
FAULT
Air flow switch is open.
ICM FAULT
Ignition control module does not
detect flame.
STACK FLUE
HIGH
Stack flue sensor detects
combustion gases above 185° F
[85° C].
STACK FLUE
OPEN
Stack flue sensor circuit is open.
STACK FLUE
SHORT
Stack flue sensor short circuit.
CONDENSATE
BLOCK
Condensate float switch detects
water in exhaust stack.
REPLACE CNC
Condensate neutralizer
cartridge’s effective lifetime has
expired.
*
FREEZE
WARNING
Ambient air temperature is too
low for gas heater operation.
(*) Note:
To clear this alarm, press the DOWN arrow and
MODE button simultaneously. The alarm may take a few
moments to clear after the buttons are pressed.
