SECTION 13: T
ROUBLESHOOTING
31
SECTION 13: TROUBLESHOOTING
13.1 General
Ens
u
re air flo
w
thro
u
gh the
heat exchanger is
appropriate per the rating
plate.
If pro
b
lems persist, contact
Ro
b
erts-Gordon, LLC at
www
.rg-inc.com
Heater Operating
TROUBLESHOOT ENDS.
N
o
Replace limit s
w
itch.
The limit s
w
itch has
tripped. See Man
u
al Reset
Limit S
w
itch Fig
u
re.
N
o
Use Tro
ub
leshooting for
A
u
tomatic Ignition B
u
rner
Systems section to test
bu
rner.
Has
bu
rner “Locked O
u
t”?
Yes
N
o
W
ith external controls (i.e.
thermostat) on, does the
bu
rner contin
u
e thro
u
gh the
heating cycle?
N
o
Yes
Does the fl
u
e
b
lo
w
er r
u
n?
N
o
Use Tro
ub
leshooting for
Fl
u
e Blo
w
er section to test
fan.
Yes
Yes
B
u
rner has locked o
u
t d
u
e
to ignition fail
u
re. Use
Tro
ub
leshooting for A
u
tomatic
Ignition B
u
rner Systems
section to test
bu
rner.
Is ignition control sho
w
ing a
"2 flashes" LED code?
Yes
N
o
Yes
Fan and limit s
w
itch are
operating normally.
Replace temperat
u
re limit
s
w
itch.
UHD 75: Press in reset
bu
tton on man
u
al reset limit
s
w
itch. UHD 100 - 125:
W
ait
10 - 15 min
u
tes for limit
s
w
itch to cool. Does fan
stop r
u
nning?
N
o
Is ignition control sho
w
ing a
"4 flashes" LED code?
Yes
N
o
Yes
T
u
rn on s
u
pplies.
Are gas & electrical
s
u
pplies on?
N
o
Yes
START
WARNING
Explosion Hazard
Installation, service and annual inspection
must be done by a contractor
q
ualified in
the installation and service of
g
as-fired
heatin
g
e
q
uipment or your
g
as supplier.
Turn off
g
as and electrical supplies before
performin
g
service or maintenance.
Failure to follow these instructions can
result in death, injury or property dama
g
e.
