Re-Verber-Ray MP-25-80N Insert Manual page 23

MP 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.
Start
Question
Is there 90-120VAC
across the fan wire
leads?
No
Check modulating
controller flash codes.
Re-connect igniter to
harness and check
voltage at igniter during
ignition sequence. Is it
approx. 120VAC?
No
Yes
Replace
ignition
module.
Check connector pins
and wires. Repair or
replace.
Correct improper
wiring.
Key
Process
Corrective
Question
Action
Is the fan obstructed
Yes
or locked in place by a
foreign object?
Is the inlet or outlet of the
heater obstructed, or is
the vent exceeding the
recommended vent lengths?
Remove obstruction.
Reconnect tubing,
free kinks, and remove
obstructions.
Replace pressure switch.
Check modulating
controller flash codes.
Replace ignition module.
Yes
No
Replace fan.
Yes
Correct faulty wiring or
replace damaged wires.
Yes
pressure switch connected and free
of kinks, damage or obstruction?
Yes The heater is equipped with a safety
pressure switch. This is a normally
switch and is located in the service
compartment. TEMPORARILY place
jumper wires across the terminals of
No the switch. Does the igniter warm up
23
4.0 Troubleshooting Guide
Remove obstruction.
Is the wiring of the
No
pressure switch
loose, damaged or
disconnected?
Yes No
Is the pneumatic tubing to the
No
open, pneumatically operated
and glow red?