Manual

21
Problem
Red LED not on during a call for heat.
Is heater
connected to its
power supply?
Connect it to the
power supply.
Yes
No
Yes
Is
proper
voltage supplied
to heater power cord
and through
power cord?
Check dataplate for
electrical supply
requirements. Provide
proper voltage. Check
circuit breakers. Check
power cord for continuity.
Is Smart Box
™
calling for heat?
Program the
building controller
and SmartBox
™ so
both are calling for
the same
temperature.
No
No
No
Yes
Are
24 volts supplied
to ignition
module?
Poor electrical connection
or broken wire present.
Repair or replace.
Yes
LED 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
Yes
Is
building controller
calling for heat?
Set controller to
call for heat.
No
Are 24 volts
supplied from
transformer?
Replace
transformer
No
Yes
Heater does not cycle from 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
SmartBox™ . 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