Bradford-White Corp BNTH Manual De Usuario

B

RADFORD

 W

HITE

 C

ORP.

Page 50

27

Internal error

Flame rod to ground

Check wiring / probe grounded, dirty probe

47

Flame rod to ground leakage

Faulty flame  detector

Clean or replace flame detector

49

24VAC voltage low/high

Faulty transformer

Check/correct supply line voltage; replace faulty
transformer

52

Motor tachometer fault

Faulty fan / fan wiring

Check fan harness wiring for continuity; replace faulty

fan circuit

53

AC inputs phase reversed

Reverse 24V hot/neutral - use common ground

61

Anti short cycle

Call for heat will be held

Change ASC timer setting

until timer resets

62

Fan speed not proved

Dirty / defective fan

Clean or replace fan; check wiring

63

LCI off

Safety chain interrupt

Check flow switch, aux high limit, LWCO, gas
pressure switches, condensate level and correct
problem

69

Outlet high limit

High limit tripped

Determine cause: low/no flow, valves closed, settings
and correct

79

Outlet high limit

80

DHW high limit

High limit reached

Check pump, time delay, valves closed, etc. and

81

Delta T inlet/outlet limit

correct overtemp

82

Stack limit

High limit reached

Could be caused by high ambient temperature, or
high return water temperature

88

Outlet T-rise limit

90

Heat exchanger high limit

High limit reached

Diagnose / repair cause of high temperature

91

Inlet sensor fault

92

Outlet sensor fault

93

DHW sensor fault

Faulty sensor or wiring

Check wiring / replace sensor; condition can be

95

Stack sensor fault

caused by short

96

OAT temperature sensor fault

Faulty outdoor air

Check wiring and sensor for short; replace sensor

temperature sensor

is open or shorted

105

Flame detected

Flame exists at burner

Clean burner of soot or other debris that could

out of sequence

when it should not be

maintain flame

106

Flame lost in MFEP

Unstable flame during

107

Flame lost early in Run

lighting / flame proving

Check venting, gas supply pressure, burner, fan, etc.

108

Flame lost in Run

sequence

109

Ignition failed

Problem with ignitor, or

Check / replace ignitor, wiring; check for shorting

other ignition-related device

in ignitor cable

113

Flame circuit timeout

Flame not established

Check all combustion components; purge gas;

within expected time limit

check ignition source

122

Lightoff rate proving failed

123

Purge rate proving failed

128

Fan speed failed / prepurge

Fan did not reach

Check fan wiring; replace fan

129

Fan speed failed / preignition

expected RPM

130

Fan speed failed / ignition

131

Fan movement detected

Fan should not be moving

Check for common venting problems or otherwise

during standby

when not powered

forced air

132

Fan speed failed during run

Fan lost or gained speed

Fan overheating or otherwise failing; check cable;

during run sequence away

replace fan

from control spec

137

ILK failed to close

No power at interlock ILK

Check J5 pin 1 for power - if no power, confirm
safeties are closed