51
110331-07 - 8/23
PHTM II
Combi Installation, Operating & Service Instructions
15
Start-Up and Checkout
(continued)
Figure 15-7: Home Screen with Error
Figure 15-8: Home Screen While Running
2. Boiler should attempt to fire several seconds after
a call for heat appears. With front door removed,
try for ignition will appear as an audible spark
(lasting approximately 4 seconds).
3. Upon initial start-up, gas train will be filled with
air. Even if gas line has been completely purged
of air, it may take several tries for ignition before a
flame is established.
Figure 15-5: Home Screen at Power Up
(no call for heat)
Figure 15-6: Home Screen with CH and DHW
Demands
1. Start boiler using lighting instructions in Figure
15-10. With boiler powered up, and with no call for
heat, display should look like Figure 15-5. Once a
call for heat is present, it will look like Figure 15-6.
Final Check Before Starting Boiler
(continued)
7. If successful ignition, display will show flame icon
(Figure 15-8).
8. Boiler will automatically perform a calibration to
properly set its air-fuel ratio (i.e. O
2
or CO
2
and CO
levels).
4. If boiler does not light after 2 retries for ignition, it
will enter a "soft lockout" and will wait for one hour
before attempting another ignition sequence. This
soft lockout can be reset by interrupting power to
boiler.
5. Once a flame has been established for first time,
subsequent calls for burner operation should
result in a flame on first try.
6. If there is a problem, display will show error code
(Figure 15-7). Refer to label on access door and
Section 19 troubleshooting to diagnose error.
