Re-Verber-Ray LD Series Installation Manual page 41

LD Series
Bypassing any switch is intended for testing purposes only. Do not leave switch bypassed
NOTICE
during normal operation or the heater's built-in safety mechanisms will be compromised.
Without Relay Board:
Start
Question
Is the power across
Yes
the 24V wire on the
circuit board and
ground 24V?
No
Is there 120V on the
primary side of the
internal transformer?
No
Repair wiring between
power in and transformer.
Is the power across
the middle (low)
terminal of 24V plug
and ground (screw on
Yes
the Burner Control Box)
24 Volts?
No
Repair thermostat or wiring from
thermostat to heater.
Check for loose wiring or restrictions in hose
connections to pressure switch.
Are they OK?
No
Replace wiring or hose connections.
* Refer to LED diagnostic Fault Code Chart.
Process Corrective
Question Action
Is the power across
the TH wire on the
circuit board and
ground 24V?
No
The relay board is faulty
and must be replaced.
Yes The internal
transformer is
faulty
and must be
replaced.
Is there 24V
across the TH and
ground terminals
on the circuit
board?
No
Correct wiring.
Yes
5.0 Maintenance
Key
With Relay Board:
Process
Question
Is the circuit
board sending
Yes
120V to the
fan?
No
Is the pressure
switch stuck in the
closed position?
No
The circuit board is
faulty and must be
replaced.
No
Is the pressure switch stuck
No
in the closed position?
Is the circuit
board sending
Yes
Yes
120V to the
fan?
*After 10-12 minutes of non-
operation has passed, is
there a flash code for APS
failure (2 or 3 flashes)?
No
Replace circuit board.
41
• Troubleshooting Guide
Corrective
Action
Is the fan
Yes
Yes
obstructed?
No
Replace
Yes
switch.
The fan is faulty and must be replaced.
Yes
No
Yes
Is the fan
obstructed?
Yes
Continued on page 43
Remove
obstruction.
Replace
pressure
switch.
Remove
obstruction.