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

MP Series
Is there 120VAC on the primary
side of the transformer across
the BLACK and WHITE wires?
No
Is there 24VAC on the
secondary side of the
transformer across the
BLUE and YELLOW wires?
Check for flash codes on the modulating controller.
Replace the ignition module.
Adjust inlet pressure.
Were the
gas lines purged of air?
Is the heater properly grounded?
Is the heater's polarity correct
(L1 and L2 reversed)?
No
Correct grounding
or fix polarity.
With a micro ammeter, check the
No
Yes
Is the relay switching
Yes
closed when energized
Purge gas lines.
No
Yes
Does the heater's gas
type match the gas
Yes
micro Amps on the FS terminals
on the ignition module. Is it
greater than 0.7 Micro-Amps?
No
Is the insulation
of the flame rod
damaged or is the
rod dirty or oxidized?
Check wiring and repair.
Replace transformer.
by the 120V coil?
No
Replace isolation relay.
supplied?
No
Contact local
representative or
factory.
Yes
Yes
No
25
4.0 Troubleshooting Guide
Replace valve wire.
No
Disconnect the main
wire to the valve and
check for resistance
Yes
across both coil pins.
Is there continuity
through each coil?
No
Replace gas valve.
No
Check manifold
pressure. Are you
Yes
reading within the
specified pressures?
Yes
Check modulating controller
for flash codes. Consult
factory.
Check modulating controller
for flash codes. Replace
ignition module.
Replace flame rod or
clean if able.
Replace wire to
flame rod.