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Part number 550-100-400/0119
123
Display
Condition Diagnostics Corrective Action(s)
("47"-7&
'"6-5
The U-Control has detected
a problem with it gas valve
output circuit
Automatic retry when condition
exists. Boiler will reset if
conditions clears. If condition
does not clear boiler will retry in
1 hour. If condition is not clear
after 1 hour, boiler will require
manual reset.
Check wire harness connections between gas valve and U-Control.
Check resistance between
If lockout reoccurs replace U-Control.
"*313&4463&
48'"6-5
Air Pressure switch is open Ultra residential boilers do not
use an air pressure switch, but
instead have a wire jumper
installed between P7 pins 4 & 5.
Reset using manual reset screen
on display
Check boiler size selected in U-Control against boiler rating label. Correct
if necessary to select the proper boiler size.
Check the P7 connection as seen on Figures 98 & 99 to determine proper
jumper wire location.
("413&4463&
48'"6-5
Gas pressure switch is open
(high or low)
Residential Ultra Boilers do
not use gas pressure switches.
Requires manual reset.
Check boiler size selected in U-Control against boiler rating label. Correct
if necessary to select the proper boiler size.
)8'"6-5
&91"/4*0/
#3%
Expansion Control Board
hardware has failed.
Residential Ultra Boilers do not
use an Expansion Control Board.
Requires manual reset.
Check boiler size selected in U-Control against boiler rating label. Correct
if necessary to select the proper boiler size.
(7'"6-5
&91"/4*0/
#3%
Gas valve output of the
Expansion Board
Residential Ultra Boilers do not
use an Expansion Control Board.
Requires manual reset.
Check boiler size selected in U-Control against boiler rating label. Correct
if necessary to select the proper boiler size.
&91#0"3%
$0.'"6-5
Communication between the
Expansion Control Board and
the U-Control Board has failed
Residential Ultra Boilers do not
use an Expansion Control Board.
Requires manual reset.
Check boiler size selected in U-Control against boiler rating label. Correct
if necessary to select the proper boiler size.
Troubleshooting (continued)
®
Series 4
gas-fired water boiler — Boiler Manual
iure Trouleshootin suestions for Ultra oilers (continued)
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