22
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START
Is the air being discharged
out of the t op of the heater 9-12
degrees cooler than the
outside air?
START
Is the air being discharged
out of the top of t he heater 9-12
degrees cooler than the
outside air?
Is the pool pump timer
set to allow extended
operation of the heater?
Is the pool pump timer
set to allow extended
operation of t he heater?
Yes
Extend the pool pump's
hours of operation to
accommodate
additional heater run
time required in cooler
conditions.
Extend t he pool pump's
hours of operation t o
accommodate
additional heater run
time required in c ooler
conditions.
Is the heater
perf orming
adequately ?
Is the heater
performing
adequately ?
Proble m
Solve d.
Problem
Solve d.
No
Yes
Does the display read : "FS" ?
Does the display read : "F S" ?
No
Yes
HEAT ONLY MODELS: "FS"
display ed indicates air
temperature may be t oo low to
support the heater's
operation. Heater will remain in
def rost until air temperature
rises.
HEAT-COOL MOD ELS: "F S"
indicates heater is def rosting.
HEAT ONLY MODELS: "FS"
display ed indicates air
temperature m ay be t oo low t o
support the heater's
operation. Heater will remain in
def rost until air temperature
rises.
HEAT-COOL MODELS:"FS"
indicates heater is defrosting.
Call IRU
Assistance:
877-278-2797
No
Yes
No
Yes
No
Problem
Solv ed.
Problem
Solv ed.
HEAT ONLY MOD ELS: Ambient
conditions too c old t o operate
heater.
HEAT-COOL MODELS: "FS"
display ed f or 5-minutes or les s
indicates normal def rost
operation.
HEAT ONLY MOD ELS: Ambient
conditions too cold to operate
heater.
HEAT-COOL MOD ELS: "F S"
display ed f or 5-minutes or less
indicates normal defrost
operation.
HEAT ONLY MODELS: Has the a i r
temperature remained above
38ºF f or sev eral hours and "FS"
has been display ed t hroughout
the period?
HEAT-COOL MODELS: Has "FS"
remained dis play ed l onger t han
5-minutes (If y es, shut heater
of f .)?
HEAT ONLY MODELS: H as t he a i r
temperature remained abov e
38ºF f or sev eral hours and "FS"
has been dis play ed t hroughout
the period?
HEAT-COOL MODELS: Has "FS"
remained dis play ed l onger t han
5-minutes (If y es, shut heater
of f .)?
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