5.1-7
7
August 1999
Fo
ur
TT
im
es
If HSI boar
d does no
t reset, then replace the boar
d. (Int
ernal boar
d f
ault.)
If HSI boar
d resets, then ha
ve
q
ualif
ied electrician check po
w
er sour
ce f
or
po
w
er q
uality pr
oblems. (F
req
uency
, line noise, line spik
es, loose
connections, t
oo small wire gauge.)
Fi
ve
TT
im
es
Rapid On/Of
f
cy
cling of the
burner
.
See flame sensor relat
ed pr
oblems in
three time flash patt
ern.
Si
x T
Ti
m
es
Lo
w micr
oam
p output fr
om flame sensor
. With a six time flash
patt
ern, the heat
er will continue t
o operat
e as normal. This
flash patt
ern means that flame sense is lo
w and that flame
failure or im
pr
oper operation can occur at an
y time. See flame
sensor relat
ed pr
oblems in three time flash patt
ern.
(1)
With an
y electrical pr
oblem, all wiring should be check
ed f
or good connections and pr
oper v
oltage and repaired if a
pr
oblem is f
ound.
(2)
IMPOR
TANT
: R
emember
, the ignition contr
ol boar
d sends and receiv
es v
oltages thr
oughout the entire operation
seq
uence. The ignition contr
ol boar
d t
erminals should also be check
ed f
or deliv
ering pr
oper v
oltages, in addition t
o
the individual com
ponents as indicat
ed b
y the respectiv
e flash patt
ern, t
o mak
e sure the boar
d itself is w
orking
pr
operly
.
(3)
In or
der t
o v
erify the diagnosis of the flashing LED or t
o reset the unit and retr
y ignition, disconnect the unit fr
om po
w
er
and then reconnect t
o po
w
er or if y
our heat
er uses a thermostat, turn do
wn thermostat belo
w r
oom t
em
perature and
then turn thermostat abo
ve
r
oom t
em
perature. When t
esting is com
plet
ed, reset thermostat t
o desired t
em
perature.
(4)
The high-limit switch will open or “trip” f
or a v
ariety of reasons, such as high gas pressure, lo
w v
oltage, e
xcessiv
e dust
and dir
t build-up within the heat
er
, dir
ty f
an assembly
, f
an is no
t tight
ened ont
o mo
tor shaf
t, and obstructions in air
inlets or discharge outlet of heat
er
.