Control Board Diagnostic Led Interpretation And Troubleshooting - State Water Heaters SBN 71-120NE Service Handbook

SBN TANK TYPE COMMERCIAL GAS WATER HEATER
CONTROL BOARD DIAGNOSTIC LED INTERPRETATION AND
TEST 1 - 120 VAC CHECK TO WATER HEATER
Conditions:
No Green display "Power" LED on.
Plugs are in receptacles.
Supply power breaker is not "open"
On/Off heater switch is "On".
TEST 1
If...
voltage is not present from on/off switch-
center black wire to ground
power is present from center on/off
terminal
voltage is not present at E13 to ground
power is present at E 13
voltage is not present from heater control
receptacle E2 black to ground
power is present at E2
©2003
SERVICE HANDBOOK
TROUBLESHOOTING
Ignition Control
120 Vac Check To Water Heater On Switch
Check for 115-125 VAC black wire to ground
115 V check to E13 terminal and 2B receptical.
...then
check power from on/off to ignition board term
E13.
to E13.
check power from E14 to heater control E2
receptacle
heater control receptacle E2.
green LE D should be on.
Board
check conditions above
check wiring from switch to break box
check wiring from on/off. Left-outside terminal
replace on/off switch.
check wiring from ignition control board E14 to
replace ignition control board.
26
Water Heater
Control
Technical Training Department
Ashland City, Tennessee