Reznor RDH Series User Manual

1307SDH_RDH--EN,page 30/32
Flowchart
The integrated control relay monitors the operation of the heater. If the heater fails to operate properly, review the flow chart below and see the operating sequence in
section 9.
The general troubleshooting chart on the following pages will also help you to determine the problem.
Trial for
Ignition
Call for Hea t
Is there a
spark across gap at
igniter?
Does gas ignite?
Is there minimum
flame current at the flame
sensor?
Is there
minimum flame current
at the con trol
module?
Replace control
module.
Check connections to flame
sensor and/or moisture in
the burner assembly.
Is the flame
sensor corroded?
Cl ean flame
sensor with emery
cloth or steel wool.
Is the sensor
located in flame ?
Re pla ce
flame
sensor.
Reposition flame sensor.
Is gas
flowing ?
Is the
igniter position
correct in the gas
flow?
Check gas pressure
and supply voltage.
If either are low,
correct and repeat
startup.
Reposition
spark i gniter.
Is there
line voltage to the gas
valve?
Is there line
voltage from valve output on
control module to
chassis?
Check wiring and
connections to gas
valve.
Replace
ignition
control
module.
Replace gas
valve.
Is there
line voltage at spark
igniter?
Check connection
at spark igniter.
_______________
Replace igniter
Is there line voltage to
the control relay?
Re pla ce
control
relay
Check wiring
connections
YES NO
YES NO
YES NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
YES NO
YES
NO
YES
NO
Is the
he ater grounded
(earthed)?
NO
Connect ground wire (earth)
to unit chassis.
YES
Is burner
jet opening
corre ct si ze for
gas used? (check
rating label on
heater)
Ai r in the
gas line?
NO
YES
Bleed air from
gas line.
Change injector
(correct size shown on
heater rating label)
NO
Yes

Reznor RDH Series Specifications

General

Brand	Reznor
Model	RDH Series
Category	Air Handlers
Language	English