Hard Lockout Condition; When Display Shows Hard Lockout Code; Flame Detected On Startup; Ignition Failed Through 5 Attempts - Weil-McLain ULTRA ULTRA-105 Service Manual

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GAS FIRED WATER BOILER SERIES
Troubleshooting
Troubleshooting procedures — when display shows hard lockout code

HARD LOCKOUT condition

Code Reason for soft lockout
00

Flame detected on startup

02

Ignition failed through 5 attempts:

02 Ignition failed through 5 attempts:
28
1 & 2
(continued)
[Display flashes first digit, "E" and last two digits (code)]
Corrective actions
1 Igniter may be cracked. Moisture gets in crack and may cause E-00.
2 Burner may be operating too hot due to incorrect combustion. Inspect flame during
operation following the procedure in Ultra Boiler Manual.
If flame is acceptable at both high and low fire, go to step 3, below.
If flame is not acceptable:
For propane boilers, verify propane orifice is correct and properly installed. See Ultra
Boiler Manual for procedure. Obtain and install propane orifice if necessary.
For correctly-orificed propane boiler or natural gas boiler, replace gas valve if burner
glows excessively.
Look into the burner inspection window after the boiler shuts down. If flame is still
3
present, gas valve may be leaking. Replace gas valve. BEFORE replacing valve check gas
line pressure coming to boiler. Pressure must not exceed 13 inches w.c. or valve damage
could occur.
1
Check ignition electrode cable, electrode connector, spade connection at MCBA and
other connections.
:
Inspect ignition electrode cable and electrode for insulation damage.
Resistance of igniter wire should be 1000 ohms +/- 50 ohms. If resistance is more or
less, replace igniter wire.
Check ground lead from ground terminal strip to heat exchanger access cover.
Verify manual gas valve in boiler is open.
1
:
2 [Models 80 or 105 only] — Verify plastic line from gas valve to air inlet elbow is con-
nected to gas valve and elbow, and line is unobstructed, with no kinks
3 Check incoming gas pressure per Ultra Boiler Manual. If gas pressure is too high, the
gas valve regulator will lock up.
4 Verify gas lines are free of obstruction.
Purge gas lines of air if necessary.
5
Verify flue gas vent and air supply piping are correctly installed, in good condition and
6
there are no obstructions.
Check voltage to gas valve. It should be approximately 19 to 21 vdc during ignition
7
attempt.
8 Check gas meter to verify gas flows when gas valve is activated.
9 Remove and inspect/clean ignition electrode per Ultra Boiler Manual. Clean white oxides
if necessary. Replace ignition electrode if in poor condition or cannot be cleaned.
10 Ensure vent is clear. Restricted vent will not allow boiler to light.
—
(pressing RESET should restart boiler immediately)
Electrical shock hazard. Turn off power to boiler when working with
wiring or replacing any boiler component.
Instructions in this supplement are based
on factory default parameter settings.
Part number 550-100-029/0810