Troubleshooting; System Observation - Bradford White EF100T150(E)*(N Service Manual

Is front panel power
switch light on,
indicating power?
Y
Is ignition module
power light on?
Y
Is ignition module
power and flame light
flashing?
N
Reset heater by
interrupting power.
16
Position front panel
N
power switch to
"ON" position.
Is there 120VAC
Y
across switch?
(see photo at right)
N
Is there 120VAC
Y
across terminal block?
(see photo at right)
N
Determine power
source problem and
correct.
Refer to ignition module
N illustration, is there 120VAC
going to module at locations
P7(1) and P7(3)?
N
Replace ignition module.
(see "Ignition Module Replacement")
IGNITION MODULE
Y Supply voltage polarity
is incorrect.
Reestablish power and
Adjust thermostat to
call for heat,
tank must be cold.
For models with Hot Surface Ignition
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Light burned out,
replace switch.
Repair/replace wire
harness to switch.
Refer to ignition module
Y
illustration, is there 120VAC
between P1(1) and P1(3)?
N
Replace ignition module.
(see "Ignition Module Replacement")
Did heater complete
Allow heater to run
heating cycle and did
through heating cycle.
blower post purge?

System Observation

WARNING
Power Switch
Terminal Block
Refer to ignition module
Y illustration, is there 24VAC
going to module at locations
P2(1) and P2(2)?
Replace transformer.
(see "Transformer Replacement")
N
See next page
Y
System is OK.
N
16