Therma Grow™ Greenhouse Heaters
Owner’s Manual • Therma Grow™
25
Problem
LE
D
F
la
sh
in
g
On
e
Ti
m
e
Fl
as
h
Pa
tte
rn
Be
gi
ns
Im
m
ed
ia
te
ly
Af
te
r C
on
di
tio
n
Oc
cu
rs
.
Ra
pi
d
Fl
as
h
Re
ve
rse polarit
y. H
av
e electrician check neutral and h
ot wire
connections that outlet hea
ter is connec
ted
to
.
Lo
ng
F
la
sh
Tw
o seconds
on, t
w
o seconds
of
f rep
etiti
vely
for
15 minu
tes.
Hea
ter has at
te
m
pt
ed t
w
o ignition trials. Hea
ter is in a
15 minu
te
w
ait per
iod be
fore at
te
m
pting its thi
rd
(final) trial
for ignition. If ignition is n
ot achi
ev
ed a
fter the thi
rd trial, the hea
ter will lock out and the
ignition cont
rol module will presen
t the three time flash pat
tern. Either rec
ycle the hea
ter or
w
ait
fo
r
hea
ter
to at
te
m
pt thi
rd ignition trial.
Is
air p
ro
ving switch stuck
closed or sho
rt
ed ? Check
continuit
y.
Is
ai
rfl
ow switch arm
binding in
fan
housing?
Free the switch . De
termine casue of
flapper binding. Check
for damage
to
fan housing,.
Ye
s
Ye
s
No
No
Replace air p
ro
ving switch
De
fecti
ve wire or poor
connections
to air p
ro
ving switch.
Repair wire or connections.
Has air p
ro
ving switch
been ju
m
pered?
Ye
s
No
Re
m
ov
e ju
m
per f
rom switch.