Ultra 1 & 2 - Status & Fault Codes

Article ID: 54

Last updated: 30 Jan, 2017

Weil-Mclain Boilers: Ultra

Re: Status & Fault Codes

The Ultra Series 1 & Series 2 boilers have a 4-digit display for monitoring operating status & fault codes.

OPERATING STATUS

After the display shows "Stby" for a brief period, the first character shows boiler status, followed by boiler outlet water temperature.

1st Digit	Boiler Status
0	Standby - no call for heat
1	Pre-purge (10 sec) or Post-purge (15 sec)
2	Ignition
3	Burner on for space heating
4	Burner on for Domestic Hot Water
5	Checking airflow before pre-purge
6*	Burner off because temperature setting has been reached
7	Pump off-delay after space heating cycle (10 sec)
8	Pump off-delay after DHW heating cycle (30 sec)
H	Test mode - manual high-fire
L	Test mode - manual low-fire

* First digit = 6 - Also shown if control module loses flame signal during run mode.

SOFT LOCKOUTS

If the burner is being held off due to a soft lockout, the display alternates between showing "9" followed by boiler outlet temperature and "b" followed by the 2-digit codes below.

* All soft lockouts will automatically reset once the condition returns to normal or has timed-out.

Code	Description
_18	Outlet temperature too high (over 203 deg). Burner off until outlet water temperature drops 9 deg below target temperature.
_19	Return temperature too high (over 203 deg). Burner off until both outlet temperature and return temperature drop 9 deg below target temperature.
_24	Return temperature higher than outlet temperature. Burner off until corrected.
_25	Outlet temperature rose too quickly. Burner off 10 to 15 min.
_26	External limit open. Burner off for 150 sec.
_29	Blower signal not zero when it should be. Burner off until condition corrected.
_30	Temperature rise more than 58 deg. Burner off for 150 sec up to 22 min. (each failed cycle adds 1 min.)
_35	Shorted flue temperature sensor. Burner off until corrected.
_40	Open flue temperature sensor. Burner off until corrected.
_52	Flue temperature exceeded 216 deg but did not exceed 225 deg. (hard lockout at 225 deg.) Burner off for 150 sec.
_65	Waiting for blower to restart.

HARD LOCKOUTS

First digit = "E" - Hard Lockout. Boiler in hard lockout requires manual RESET.

Code	Description
00	Flame detected on startup
02	Ignition failed after 5 tries
03	Internal control failure
04	Power lost after lockout
12	External limit open (wired in hard lockout circuit)
18	Outlet water temperature was higher than 210 deg.
19	Return water temperature was higher than 210 deg.
25	Temperature rise greater than 58 deg
28	No signal from blower
29	Blower signal not zero when it should be
31	Outlet temperature sensor shorted
32	Return temperature sensor shorted
36	Outlet temperature sensor open
37	Return temperature sensor open
44	Internal control failure
52	Flue temperature was higher than 225 deg.
60	Internal error reading parameters
61	Airflow circuit failure
65	not enough blower driving force

INFORMATION MODE

Press Mode button 2 times from Standby mode to enter Info mode.
Press Step to go to next parameter.

Param	Description
1	Measured outlet water temperature
2	Measures return water temperature
3	Not used
4	Outside air temperature (if connected)
5	Flue temperature
6	Target outlet water temperature
7	Outlet water temperature rate of change (deg/sec)
8	Return water temperature rate of change (deg/sec)
9	Not used