Service manual

VANTAGE
®
EV INSTALLATION MANUAL
ROBERTS
-GORDONpg 38
Section 13. Troubleshooting
Remove obstruction.
Replace
Switch.
Check wiring to the burner.
Make sure the burner is
plugged in.
Correct gas problem.
See page 27 for details.
Is there power (120V) between
control panel BH and BN
terminals of the zone
calling for heat.
Is there power (120V) at the
burner receptacle?
Is there proper gas pressure
and flow to the burners?
Is blower side
door in place?
Remove door. Is voltage
at door switch 120V?
Check voltage between door
switch and burner neutral
(white).
Disconnect wires from MBR
and MBR-COM. Is there at least 12V DC between the terminals?
Reconnect MBR and
MBR-COM. Are the vacuum
proving and/or motor end
switches operating properly?
Replace appropriate zone
relay on main board.
(P/N 90438100, Omron
G2R-1-S, or equivalent)
Replace Door. Check wiring and Diagram.
Replace main control board.
(P/N 90437500)
Repair or Replace switches
as necessary.
Remove obstruction.
Is the vent pipe or the inlet of
the burner obstructed?
Is the igniter gap
set at 1/8"?
Unplug burner and check
igniter and ignition wire. Are
they Damaged?
Repair, replace or tighten
hoses as necessary.
Are the air hoses to the
pressure switch secure
and leak free?
Carefully reset spark
gap to 1/8".
Replace igniter and ignition wire
as needed.
Check vacuum per page 36.
Is it okay?
Reset dampers
Remove the blue and yellow
wires from the transformer. Is
there 24V at the transformer
secondary?
With the blue and yellow wires still removed, is the voltage at
the transformer black and
white leads 120V?
Check wiring between the
power cord and transformer.
Replace pressure switch.
(P/N 90436701)
Reconnect transformer wires.
Place a jumper wire across the
pressure switch. Is there a
spark?
Replace transformer.
(P/N 90436900)
Depress switch. Check voltage.
Is it 120V?
Check voltage between door
switch and burner neutral
(white).
Is there spark at the igniter?
Replace
Switch
No
Yes Yes Yes Yes Yes Yes
Yes Yes No No
No
No No No
No
Yes Yes
No
No No
Yes No
No No No
Yes
YesNoNo
Yes
Yes
Yes
Turn up thermostat.
Does the pump turn on?
Is there power (120V) to the
control panel H and N
terminals?
Test thermostat by placing a
jumper wire between COM
and appropriate thermostat
T(1,2,3,4) terminal. Does the
pump turn on?
Is there power (120V)
between the panel
MH and MN terminals?
Is the motor hot?
Motor may have tripped
overload switch. Wait 10-15
minutes for automatic reset.
Check circuit breaker and/or
fuse on panel supply circuit.
Replace fuse.
(P/N 90438200)
250V 3A size 3AG
Is the fuse on the circuit
board blown?
Disconnect power to the motor.
Does the motor turn freely?
Is the pump impeller
obstructed?
Replace main control board.
(P/N 90437500)
Is there at least 12V DC at the
pump relay coil? (W2 and W1
on circuit board.)
Replace pump relay.
(P/N 90437900, Omron G4B-
112T1-US, or equivalent)
Motor bearings may have failed.
Replace motor.
Check thermostat wiring and
replace thermostat if necessary.
Is the motor connected properly?
Refer to the wiring diagrams on the motor and in the installation manual
No Yes No Yes Yes
No
No
Yes
No
No
Yes No
Yes
No
No
No
No
Yes
After a 45 pre-purge period,
does the burner light?
Yes