User guide

Problem
LED light not on during a call for heat.
Is heater
plugged in?
Plug heater in.
Yes
No
Yes
Yes
Is
building controller
calling for heat?
Set controller to
call for heat.
Is
proper
voltage supplied
to heater power cord
and through power
cord?
Check dataplate for electrical
supply requirements. Provide
proper voltage from electrical
supply. Check circuit breakers
in building electrical system.
Check power cord for
continuity.
Are 24 volts
supplied from
transformer?
Replace
transformer
No
No
No
No
Yes
Are
24 volts
supplied to
ignition
module?
Poor electrical connection or broken
wire present. Repair or replace.
Yes
LED light in control module is defective. Replace ignition module.
Is
proper
voltage supplied
to transformer?
Check electrical
connections and
power supply to
transformer.
Repair as necessary.
No
Yes
21
Heater does not cycle above minimum heat output.
Is temperature
setting aligned
between building
control and
SmartBox
™
No
Is proper gas
pressure supplied
to heater?
Yes
Provide proper
pressure to heater and
check with a gauge.
No
Ensure temperature
settings are aligned
between the building
controller and the
Smart ox™ . Reset if
needed.
Is variable rate
solenoid on gas
control valve
receiving DC volts
from SmartBox™?
No
Yes
Problem
Measure across terminals of
modulating gas control valve for
anywhere from 1-15 volts DC.
If absent, check all wiring. If wiring is
good, the Smart Box™ must be
inspected for proper operation.
Defective variable rate gas control solenoid valve. Replace gas control.
Yes