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70284701
Section 7 Electronic Control Troubleshooting
61. CONTROL DISPLAY – NO VISIBLE DISPLAY – OPL MICROPROCESSOR MODELS
TMB1823S
Is there voltage
supplied to the unit?
Is there voltage to the
input side of the
primary fuse(s)?
Is there voltage to the
output side of the
primary fuse(s)?
Is there voltage
across the primary side
of the transformer?
Is there voltage across
1 & 4 of transformer
secondary?
Is there voltage across
terminals H3-3 &
H3-4 on OPL Micro?
Is there voltage across
fuse on OPL Micro?
Connect supply
voltage and run unit.
Correct wiring
between primary
fuse and supply.
Replace primary
fuse.
Correct wiring
between transformer
and primary fuse.
Replace transformer
Correct wiring
between OPL Micro
and transformer
secondary.
Replace OPL Micro.
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Replace fuse.
Gas, steam
and electric heat.
Single and three
phase supply.
Note: Reference voltage to
supply neutral.
TMB1823S
Summary of Contents for D11
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