Install Instructions

49
Installation & Service Manual
8 Troubleshooting (continued)
Is the Spark
Ignitor sparking?
Replace
Ignition
Module
Are Wires W1 – W3 on TST20036-2
plugged into CN9 on TST20036-1
(see FIG. 5-5)?
Plug connector into
controller
Is there continuity on the
Spark cable?
•Check for 24 VAC on 24V
terminal (Gray Wire) on
Ignition Module
Is there 24 VAC (Purple Wire)
on the 4-Pin connector plug
(CN1) on TST20036-1 (see FIG. 5-5)?
Is there 24 VAC
at R1 and W1 on
the terminal strip?
Check each of
the following for
an open:
•Brown and
Purple Wire on
the LWCO plug
•Rollout Switch
•Manual Reset
High Limit
•Spill Switch
If any of these
devices are
open, press the
reset button
•Check voltage to and
from the transformer
•Check incoming
120 VAC
•Check gas pressure
•Make sure Gas Valve
knob is "ON"
Is there 24 VAC
(Tan Wire) on the
4-Pin connector plug
(CN1) on TST20036-1
(see FIG. 5-5)?
Check each of
the following for
an open:
•X and B on terminal
strip
•Purple and Black
Wires on the Vent
Damper Plug
•V and P on terminal
strip
•Auto-Reset High
Limit
Check for an
open sensor
•If there is no open
sensor, make sure
there's a call for
heat
•If a call for heat is
present, replace
the temperature
controller
Is the pilot staying
on?
•Check the pilot
tube for gas
•Check draft
Is the gas valve
getting 24 VAC
to the MV
terminal?
Replace
Ignition
Module
Step 1:
Step 2:
Step 3:
Step 4:
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
NO
NO
YES
YES
YES
NO
IMG00286
Troubleshooting Guide: M9 Solution Boilers