Weil-McLain Ultra Manual page 86

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gas fired water boiler
Troubleshooting
Figure 95
U-Control display toggles when in lockout, with screen flashing red to gray
Message displayed Condition causing manual reset / lockout
Manual reset limit open Set if manual reset limit open
Heat exchanger temp high Set if either the heat exchanger outlet or inlet is higher than 200f
Supply water too fast Set if supply water too fast has occurred 5 times since last power cycle
Supply > return by 58 °F Set if supply > return has occurred 20 times since last power cycle
Temperature sensors Hx inlet or outlet, or flue sensor is open or shorted
Flue temperature high Set if flue temp > 220 °F
Flame fault Flame detected when there should be no flame (actual flame or flame detect circuit hardware fault)
Ignition fault Set if more than 5 ignition retries
Hardware fault Set if issue with flame detect hardware (could see dual fault here - flame and hardware)
Ram check fails or rom check fails
Gas valve fault Occurs if hardware controlling the gas valve does not open
or close during the ignition sequence as expected within allotted time.
Blower fault Occurs if there is rpm feedback when blower should be off during ignition sequence.
Occurs if rpm cannot be control to within +/-100rpm before ignition.
Occurs if there is no rpm feedback during ignition sequence.
Lwco fault Set if open more than 1 second
86
— Boiler Manual
(continued)
Reset action
Reset with manual reset on control
Reset with manual reset on display
Reset with manual reset on display (also resets 5 times counter)
Reset with manual reset on display (also resets 20 times counter)
Reset with manual reset on display
Reset with manual reset on display
Reset with manual reset on display
Reset with 1 hr auto reset – OR – with power cycle
Reset with manual reset on display
Reset with manual reset on display
Reset with manual reset on display
Reset with manual reset on display
Part number 550-100-066/0608