Dunkirk Q95M-200 Modulating Condensing Boiler - Manual (Page 19)

19
HARD LOCKOUT (Display flashes first digit “E” and last two digits (code))
Code Reason For Hard Lockout Corrective Actions (pressing RESET should restart boiler immediately):
00 Flame detected on startup.
1
Burner may be operating too hot due to incorrect combustion. Inspect flame during
operation following procedure in this manual. If flame is acceptable at both high and
low fire, go to step 2. If flame is not acceptable:
For propane boilers, verify propane orifice is correct and properly installed. Obtain
and install propane orifice if necessary.
For correct orifice propane or natural gas boilers, replace gas valve if burner glows
excessively.
2
Look into the burner inspection window after the boiler shuts down. If flame is still
present, gas valve may be leaking. Replace gas valve. BEFORE replacing valve,
check gas line pressure coming to boiler. Pressure must not exceed 13” w.c. or valve
damage could occur.
02 Ignition failed through 5 attempts.
1
If no ignition spark occurs:
Check ignition electrode cable, electrode connector, and connections.
Inspect ignition electrode cable and electrode for insulation damage.
Check ground lead from ground terminal strip to heat exchanger access cover.
2
If spark occurs, but no flame:
Verify manual gas valve in boiler is open.
Verify plastic line from gas valve to air inlet elbow is connected to gas valve and
elbow, and line is unobstructed with no kinks.
Check incoming gas pressure.
Verify gas lines are free of obstruction and purge gas lines of air if necessary.
Verify flue gas vent and air supply piping are correctly installed, in good condition,
and free of obstructions.
Check voltage to gas valve (approx. 19-21 VDC (24 vrac) during ignition attempt).
Check gas meter to verify gas flows when gas valve is activated.
Remove and inspect/clean ignition electrode. Clean white oxides if necessary and
replace ignition electrode if in poor condition or unable to be cleaned.
Disconnect gas valve from Venturi. Inspect Venturi gas line to verify there are no
obstructions. Replace gas valve.
Check for possible flue gas recirculation at vent/air terminations or inside boiler
housing.
If gas valve is powered, gas flows when activated, and above steps have been
verified, replace gas valve and retry.
3
Flame occurs but flame signal too low (less than 3 vdc between X1-5 and ground):
Inspect flame at both low and high fire rates. Inspect and clean burner if necessary.
Replace burner if not in good condition.
Check gas flow rate at gas meter with boiler at high fire. If input is not within about
10% of boiler rating, replace gas valve. (Length of the vent/air piping will affect
boiler firing rate, with longer piping causing lower inputs.)
Check ground wire and connections from ground terminal screw to X1-6 terminal on
wiring harness. Use ground continuity meter to verify good ground path.
Follow procedure to inspect and clean ignition electrode. Replace ignition electrode if
necessary.
If above does not correct problem, replace control module.
03 Gas Valve Disconnected. 1 Verify gas valve connection.
04 Voltage lost after lockout occurred. 1
Control module will only restart with manual reset, even after power loss (but the
error code information is lost).
05
Internal control failure. 1 Reset control and retry. If problem persists, replace control module.
06
07
08
9 - TROUBLESHOOTING