Specifications

56
stcudorP retaW htimS .O .A Service Workbook
Ashland City, Tennessee 2005© Training Department
TROUBLESHOOTING ERROR CODES
Error Code "070" Stage - Indicates Power Vent Problem
On Display Board red light is on "Power Vent Fail*"
Display Window will show "LOCO 070".
Only if an optional Power Venter has been installed in the exhaust vent. Power Venter may
or may not have been purchased from A.O. Smith. Power Venter Relay would connect to
external 24V Junction Box, Terminal 5, 6 and 7. If Power Venter is not being used, a factory
installed jumper should be in place between terminals 5 and 7 in the 24V Junction Box.
Central Control Board
Junction Box
(J Box)
Lockout
Status
If error code is … … then

not proving draft adjust venter air shutter check for vent
blocka
g
e (Venter's Provin
g
Switch t
y
picall
y
closes at -.05" W.C.)
070

check total allowable vent len
g
th.

check for 24 VAC from CCB CN11, Pin 3 to 24 VAC "J" Box

if Power Venter Pressure Switch is closed, 24 VAC "J" Box,
Terminal 5 should have power.
Soft
"070" indicates Power Vent Failure.