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
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 |