Wittus MCZ, Техническое учебное пособие

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Trouble Shooting Alarms -
Continued
Alarms 5 , 6 and 14 involve the Air Flow Sensor

A 05
Comb blower 2,700 RPM with < 90 L/min air flow for 20 seconds – blocked flue

A 06
Comb blower 2,500 RPM with < 160 L/min air flow for 20 minutes. This indicates a dirty
stove or air filter a plugged grate or a poor door seal. A 06 can also be caused by a dirty air flow
sensor. The sensor is very delicate and should never be touched. Clean with a soft brush.

A 14
Air Flow sensor disconnected or broken. If there is no replacement sensor available the
stove can still be run in a pinch by de-activating the flow sensor. The stove will run but will burn
poorly, especially if there is no vertical pipe.

Other Alarms

A 07
Combustion blower working properly < 40 L/min air flow

A 08
Combustion blower at < 500 rpm. At a 452 rpm reading on the panel the combustion
blower is actually not running at all.

A 10
Igniter broken or disconnected. If you get A 10 with a new stove, moisture could be causing
a ground. Dry out the stove and try again.

A 12 Remote out of range for 3 hours. This is the only alarm that does not need to be cancelled.
The stove will continue to work in the last mode set until communication is restored.

A 13
Motherboard. Not always a bad Motherboard can also be triggered by a poor wire
connection or overheating of a component which disables communication back to the
Motherboard.