Instruction manual

49
D TROUBLESHOOTING
PROBLEMS CAUSES CHECKS (IF NECESSARY) REMEDIES
(IF NECESSARY)
the pilot li
g
ht of power switch is off there isnt electrical suppl
y
check the electrical suppl
y
level restore the electrical suppl
y
the fuse doesnt work check the fuse replace the fuse
the power switch is off check that the power switch is on turn the power switch on
the power switch doesnt work check the power switch operatin
g
replace the power switch
pilot li
g
ht of power switch doesnt
work
check the pilot li
g
ht of power switch
operatin
g
replace the power switch
the transformer lamp control,
(
DL8
)
, is off
115V isnt reachin
g
the transformer
input
check the transformer has 115V
input
restore the electrical suppl
y
the transformer doesnt work
check the transformer has 24V
output
replace the transformer
the DL8 doesnt work check DL8 operatin
g
replace the electrical control board
the heater temperature lamp
control,
(
DL1
)
is off
the heater temperature control
contacts are open
check that the heater has the
required temperature
increase the heater temperature
set
24V isnt reachin
g
C contact of
heater temperature control
check 24V presence on C heater
temperature control contact
restore the electrical connection
the heater temperature control
doesnt work
check heater temperature control
operatin
g
replace the heater temperature
control
the DL1 doesnt work check DL1 operatin
g
replace the electrical control board
the low water cutoff lamp control,
(
DL2
)
, is off
there isnt enou
g
h water in the
heater
check theres enou
g
h water in the
heater
restore the water ri
g
ht level in the
heater
low water cutoff doesnt work check the low water cut-off
operatin
g
replace the low water cut-off
DL2 doesnt work check DL2 operatin
g
replace the electrical control board
the NC pressure switch lamp control,
(
DL3
)
,
is off
24V isnt reachin
g
the C contact
of pressure switch
check theres 24V on the C
contact of pressure switch
restore 24V on the C contact of
pressure switch
pressure switch contact is on NO check the flue
g
as dischar
g
e fan is
off
replace pressure switch
DL3 doesnt work check DL3 operatin
g
replace electrical control board
the NO pressure switch lamp
control,
(
DL4
)
, is off
flue
g
as dischar
g
e fan is off
check the flue
g
as dischar
g
e fan is
on
replace the flue
g
as dischar
g
e fan
115V isnt reachin
g
the flue
g
as
dischar
g
e fan
check 115V is reachin
g
the flue
g
as dischar
g
e fan contacts
restore the electrical suppl
y
pressure switch contact is on NC check the pressure switch
operatin
g
replace the pressure switch
DL4 doesnt work check DL4 operatin
g
replace the electrical control board
the i
g
nition module lamp control,
(
DL7
)
, is off
24V isnt reachin
g
i
g
nition module check 24V is reachin
g
i
g
nition
module contacts
restore 24V
DL7 doesnt work check DL7 operatin
g
replace the electrical control board
the
g
as valve lamp control,
(
DL5
)
,
is off
24V isnt reachin
g
g
as valve check 24V is reachin
g
g
as valve
contacts
replace i
g
nition module
DL5 doesnt work check DL5 operatin
g
replace the electrical control board
the room thermostat lamp control,
(
DL6
)
, is off
room thermostat contacts are
open,
(
if an
y)
check room thermostat operatin
g
replace the room thermostat
room thermostat doesnt work,
(
if
an
y)
check room thermostat operatin
g
replace the room thermostat
DL6 doesnt work check DL6 operatin
g
replace the electrical control board
the circulator pump switch li
g
ht is
off
circulator pump switch is off check heater temperature is hi
g
her
than 140°F
check heater temperature is hi
g
her
than 140°F
dhw priorit
y
thermostat contacts
are open
check heater temperature is hi
g
her
than 140°F
increase the heater temperature,
(
if
necessar
y)
room thermostat contacts are open check room thermostat operatin
g
replace the room thermostat
circulator pump switch li
g
ht doesnt
work
check circulator pump switch li
g
ht
operatin
g
replace the circulator pump switch
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