25
Mynute
FAULT FINDING TEST ‘C’(Mynute 35e): turn the selector to the “on” position
ST
AR
T
Does
pump r
u
n
Is there
230V betw
een
ter
m
inals
M15.1 &
M15.2
NO
NO
Replace main
PCB
YES
NO
Replace pump
Chec
k wir
ing &
connections
Does
fan r
u
n
YES
Is there
230V at L & N
of pump
Is there
a spar
k at the
electrode
NO
YES
Go to test "D"
YES
NO
Is there
230V betw
een
ter
m
inals
M12.1 &
M12.2
YES
Is there
230V betw
een
L & N
ter
m
inals of
fa
n
Chec
k
wir
ing &
contin
uity
YES
Replace f
a
n
NO
Chec
k flue gas
tube
YES
Is there
a v
o
ltage <1VDC
betw
een ter
m
inals
M3.10 & M3.11 on
PCB
NO
Chec
king wir
ing
&connections or
analog air sensor
NO
YES
Replace main
PCB
YES
Chec
k wir
ing &
connections
,
chec
k w
a
ter
pressure s
w
itch
NO
YES
Chec
king wir
ing
& connections
Is there
a v
o
ltage >0.5VDC
betw
een pin M3.11 on
main PCB and the g
ra
y
wire on analog air
sensor
NO
- chec
k flue gas tube
- chec
k wir
ing & connections
- chec
k analog air sensor
- chec
k f
a
n
Is there
a v
o
ltage >0.5
VDC betw
een pins
M3.10 & M3.11 on
main PCB
YES
YES
NO
Is there
24Vdc betw
e
en
M5.3 & b
lac
k
wire of b
u
rner
ther
mostat
Chec
king wir
ing
& connections
Go to test
“E”
Chec
king b
u
rner
ther
mostat or
comb
ustion
NO
Is there
24Vdc betw
een
ter
m
inals M5.3
& M3.5
YES
Is there
24Vdc
betw
een
ter
m
inals
M5.3 & M5.4
NO