Bradford White eF Series Service Manual

Does blower
energize?
N
Y
Page 27
Sequence of operation:
With the thermostat calling for heat, prior to energizing blower, the ignition module checks the exhaust pressure switch for normal
switch position of normally open. If the exhaust pressure switch contacts are closed (not in normal position), the ignition module
waits 45 seconds for the pressure switch contacts to open. If the pressure switch contacts do not open after 45 seconds, the
ignition module locks out with the PURGE LED flashing indicating a pressure switch fault.
I
s there continuity
T
hrough GREY
wire leads of heater side
safety circuit harness?
(see photo 20)
N
Y
I
s there continuity
t
hrough RED
wire leads of heater side
safety circuit harness?
(see photo 20)
N
Check PURGE LED status.
Y
S
afety Circuit OK,
See Blower.
(Page 25)
Replace exhaust
pressure switch
(see Pg 29)
Replace vent
safety switch.
(see pg 39)
Call technical
support.
Y
N
Depress reset
button on vent
safety switch. Is
there continuity
across high limit
switch?
(see photo 21)
Refer to
“Check Collector Pressure”
(see Pg 28)
Check blower for proper
operation (see page 25)
Is blower OK?
N
Check PURGE LED status
on ignition module,
Flashing after 45 seconds?
On within 5 minutes? Pressure switch is OK.
Y
Y
Safety Circuit Trace
Does heater
function?
Verify proper
switch operation.
(see pg 38)
N
Y
L
ED Status
O
nly power LED is on, or
P
urge LED flashing.
Service Procedure EF-VI
Exhaust Pressure Switch Testing and Replacement
N
20
Heater side
harness
Control side
harness
21
Reset button
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Flashing after
5 minutes?
Call for technical
support.
Correct blower problem
(see page 25)
N
Y
Page 27
Does blower
energize?
N
Y
Page 27
Sequence of operation:
W
ith the thermostat calling for heat, prior to energizing blower, the ignition module checks the exhaust pressure switch for normal
switch position of normally open. If the exhaust pressure switch contacts are closed (not in normal position), the ignition module
w
aits 45 seconds for the pressure switch contacts to open. If the pressure switch contacts do not open after 45 seconds, the
ignition module locks out with the PURGE LED flashing indicating a pressure switch fault.
Is there continuity
Through GREY
wire lead of heater side
safety circuit harness?
(see photo 20)
N
Y
Is there continuity
through RED
Lead wires of heater side
safety circuit harness?
(see photo 20)
N
Check PURGE LED status
on ignition module, is LED
off then Flashing after 5
minutes?
Y
Safety Circuit OK,
See Blower.
(Page 25)
Replace exhaust
pressure switch
(see Pg 29)
Replace vent
safety switch.
(see pg 39)
Call technical
support.
Y
N
Depress reset
button on vent
safety switch. Is
there continuity
across high limit
switch?
(see photo 21)
Refer to
“Check Collector Pressure”
(see Pg 28)
Is Blower wheel secured to
blower motor shaft?
Y
Check PURGE LED status
on ignition module,
Flashing after 45 seconds?
Check amp draw through
BLACK wire lead of blower
motor. Is there .6 to 1
amp?
Replace blower.
(see pg 26)
Y
N
Safety Circuit Trace
Does heater
function?
Verify proper
switch operation.
(see pg 38)
N
Y
L
ED Status
O
nly power LED is on, or
Purge LED flashing.
Service Procedure EF-VI
Exhaust Pressure Switch Testing and Replacement
N
20
Heater side
harness
Control side
harness
21
Reset button
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.

Bradford White eF Series Specifications

General

Type	Tank
Efficiency	High Efficiency
Vent Type	Power Vent
Fuel Type	Natural Gas or Propane
Recovery Rate	Varies by model
Capacity	40-100 gallons
Warranty	6 or 10 Year Limited Tank & Parts Warranty (varies by model)