Test 3 - Continuity Check Of High Limit (Eco) - State Water Heaters SANDBLASTER SBD30 150 Service Handbook
Self-cleaning induced draft multi flue commercial gas water heaters
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SBN71-120 thru SBN85-390, SBD30-150/199 TANK TYPE COMMERCIAL
TEST 3 - CONTINUITY CHECK OF HIGH LIMIT (ECO)
Conditions:
Power On – No Hot Water
●
Red, heater control "Call for Heat"
●
LED – on
Red ignition control board
●
diagnostic LED – 4 Flashing
Note LED Flash Code before
●
resetting water heater control.
See Description of diagnostic LED
●
Flashes.
Turn Power "Off"
●
TEST 3
f I
...
continuity is indicated (ZERO "0.0" Resistance)
continuity is not present (meter reads "0.L")
w
t a
r e
s i
e l
s s
h t
a
n
1
2
° 0
F
S
a t
e t
W
t a
r e
H
e
a
e t
Ashland City, Tennessee
GAS WATER HEATER SERVICE HANDBOOK
s r
©
2
0
0
7
0.0
Ohms
Continuity check of ECO (energy cut-off, high limit)
Black to Black wires of upper probe. Power is off.
h t
e
n
. .
. . .
opens at 203° F; closes at 193° F. If water is
below 193° F, continuity is correct.
replace ECO sensor, if water temperature is
below 193° F.
•
e r
s
t e
s
a t
u t
•replace heater control if control will not manually
reset.
3
6
s
L
E
D
s
h
o
u
d l
b
e
o
. n
T
e
c
h
n
c i
l a
T
a r
n i
n i
g
D
e
p
a
t r
m
e
t n
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