Thermo Pride CMA4-50D36N, Installation And Service Manual, Page: 56 / 66

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assure proper furnace operation. Follow the cleaning, removal and replacement
procedure below.
FILTER MAINTENANCE PROCEDURE
The filter is located inside front door of the CMA/CMC. Remove filter retaining rod
and remove dirty filter. Clean the filter by vacuuming, rinsing with tap water,
hosing or dipping in an ordinary detergent solution. After cleaning, replace the
completely dry filter and retain with retaining rod. If the filter has a mesh, the
mesh side of the filter must be towards the furnace.
FILTER REPLACEMENT
Should the filter require replacement, replace with like size and type filter as
originally supplied with furnace.
IMPORTANT:
Remind homeowner of importance of monthly filter inspections
during the heating season to ensure efficient and trouble-free operation of their
furnace.
VIII. TROUBLESHOOTING
NOTICE: BEFORE TROUBLESHOOTING, FAMILIARIZE YOURSELF WITH THE
START UP AND CHECKOUT PROCEDURE.
ALL INSTALLATION AND SERVICES MUST BE PERFORMED BY QUALIFIED
HEATING CONTRACTORS.
To assist you in troubleshooting this furnace, it is equipped with an integrated
ignition control with diagnostics. These diagnostics evaluate what control system
has experienced a failure and will activate a flashing light on the control in
different sequences to help pinpoint the failure which has occurred.
IMPORTANT: For your convenience, a sight glass has been installed in the
blower door of this furnace. The number of flashes in groups should be observed
through this sight glass and recorded before turning off power to the furnace.
Momentarily pressing the “Last Error” button on the control board will initiate the
display of the last 5 failure codes, even if the furnace power has been shut off.
Holding the “Last Error” button for 5 seconds, or more, will erase the error
history.