Diagnostics
Installation, use and maintenance manual – GAHP-AR
41
8
Code
Cooling
Hea
ting
Description
W
arning
Err
or
Possible c
auses / C
hecks
651
X
Ac
tiv
ation of an
tifr
ee
ze func
tion - c
old
module
W
ar
ning aut
oma
tically r
esets onc
e the func
tion
ceases and star
ts the standar
d 10 minut
e c
ycle
do
wn per
iod
NA
Lo
w out
door ambien
t c
onditions
Possible oper
ation in c
onjunc
tion with other chillers causing w
at
er t
emps flo
wing
thr
ough unit t
o dr
op belo
w an
tifr
ee
ze set poin
t
If the pr
oblem persists
, c
on
tac
t A
T
652
X
Ac
tiv
ation of defr
osting func
tion
The w
ar
ning is gener
at
ed when the hea
ting
module defr
ost is enabled
W
ar
ning aut
oma
tically r
esets onc
e the defr
ost
func
tion has c
omplet
ed or if a tr
ansition fr
om
hea
ting t
o c
ooling is r
equest
ed
NA
-
654
X
X
Opposit
e r
ev
ersing v
alv
e micr
o-swit
ch
engaged
NA
Reset b
y po
w
er
ing unit off
,
then on. An aut
oma
tic r
eset can
oc
cur if
, af
ter a ne
w tr
ansition
from one mode t
o the other
, the
micr
o-swit
ch sta
tus emer
ges t
o
be c
or
rec
t
Bad/stuck micr
o-swit
ch - either hea
ting or c
ooling
M
alfunc
tion in r
ev
ersing v
alv
e ac
tua
tor
Bad swit
ch c
onnec
tion a
t boar
d
M
alfunc
tion in auxiliar
y hea
ting boar
d - not ener
gizing ac
tua
tor
M
iss-
wir
ing of micr
o-swit
ches
Ac
tua
tor pla
te ma
y not be fully engag
ing micr
o-swit
ch
If the pr
oblem persists
, c
on
tac
t A
T
655
X
X
Unr
ec
og
niz
ed r
ev
ersing v
alv
e position
NA
Reset b
y po
w
er
ing unit off
,
then on. An aut
oma
tic r
eset can
oc
cur if
, af
ter a ne
w tr
ansition
from one mode t
o the other
, the
micr
o-swit
ch sta
tus emer
ges t
o
be c
or
rec
t
Bad/stuck micr
o-swit
ch - either hea
ting or c
ooling
M
alfunc
tion in r
ev
ersing v
alv
e ac
tua
tor
Bad swit
ch c
onnec
tion a
t boar
d
Ac
tua
tor pla
te ma
y not be fully engag
ing micr
o-swit
ch
If the pr
oblem persists
, c
on
tac
t A
T
656
X
X
Ambiguous r
ev
ersing v
alv
e position
NA
Reset b
y po
w
er
ing unit off
,
then on. An aut
oma
tic r
eset can
oc
cur if
, af
ter a ne
w tr
ansition
from one mode t
o the other
, the
micr
o-swit
ch sta
tus emer
ges t
o
be c
or
rec
t
Bad/stuck micr
o-swit
ch - either hea
ting or c
ooling
M
alfunc
tion in r
ev
ersing v
alv
e ac
tua
tor while simultaneously the opposit
e micr
o-
swit
ch is stuck open
M
iss-
wir
ing of micr
o-swit
ches
If the pr
oblem persists
, c
on
tac
t A
T
660
X
Defr
osting malfunc
tion
FW v
er
. 3.031 or la
ter
W
ar
ning will aut
oma
tically r
eset when the
nex
t defr
osting c
ycle r
aises the t
emper
atur
e as
requir
ed
Er
ror can be r
eset via S61, DDC or
po
w
er off
Fault
y TE
VA
sensor
Fault
y defr
ost v
alv
e
Fault
y ac
tua
tor
Hea
ting c
on
trol cir
cuit boar
d malfunc
tion or fault
y wir
e c
onnec
ting hea
ting boar
d
and ac
tua
tor
If the pr
oblem persists
, c
on
tac
t A
T
661
X
X
Oil pump pr
iming c
ycle ac
tiv
at
ed
Double pist
on model only
#15 ON/OFF c
ycles with 10 sec
onds ON and 30
sec
onds OFF
NA
-
678
X
High hot w
at
er outlet t
emper
atur
e
W
ar
ning aut
oma
tically r
esets onc
e the c
on
-
dition c
eases or if a tr
ansition t
o c
ooling fr
om
hea
ting is r
equest
ed
NA
Ligh
t load c
onditions
No oper
ation of air side or t
er
minal de
vise
Possible applica
tion or piping issues if w
or
king in c
onjunc
tion with 3r
d par
ty
boilers allo
wing hott
er w
at
er t
o en
ter hea
t pump
If the pr
oblem persists
, c
on
tac
t A
T
679
X
Ac
tiv
ation of an
tifr
ee
ze func
tion - hea
ting
module
W
ar
ning aut
oma
tically r
esets onc
e the func
tion
ceases and star
ts the standar
d 10 minut
e c
ycle
do
wn per
iod
NA
Lo
w out
door ambien
t c
onditions
680
X
X
Inc
omplet
e boar
d par
amet
ers
NA
Ne
w par
amet
er setting is r
equir
ed
Ne
w par
amet
er setting is r
equir
ed
If the pr
oblem persists
, c
on
tac
t A
T
681
X
X
In
valid bank 1 par
amet
ers
NA
Er
ror can be r
eset via po
w
er off
If the pr
oblem persists
, c
on
tac
t A
T
682
X
X
In
valid bank 2 par
amet
ers
NA
Er
ror can be r
eset via po
w
er off
If the pr
oblem persists
, c
on
tac
t A
T
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