6 720 816 815 (2018/08) Greentherm T9800 SE 160/199 | SEC 199
60 | Problem solving
9Problem solving
9.1 Error code diagnostics
Installation, maintenance and repair must only be carried out
by qualified contractors. The following table describes the
solutions for possible problems.
To remove error codes from the display,
▶ Touch the On/Off button more than 3
sec. (long press).
Display Description Solution
A0 Water temperature sensors [17] [19] [20]
disconnected or damaged.
▶ Check sensor wire connections.
1)
2)
▶ Replace the sensor and/or wire connections, if the
problem persists.
1)
A1 Air temperature inside the cabinet [18] is above
158 °F. Appliance regulates power to protect
against overheat.
▶ External air temperature is above 140 °F.
▶ Check for flue leakages inside the appliance or in
concentric vent.
1)
A2 External water temperature sensor/aquastat [21]
disconnected, damaged or not properly installed.
▶ Check temperature sensor and associated
connections.
1)
2)
▶ Check sensor position in the tank pocket.
▶ Verify if correct recirculation settings are in use
(section 6.5.2).
▶ Replace the sensor and/or wire connections, if the
problem persists.
1)
A3 Flue gases temperature sensor [15] disconnected
or damaged.
▶ Check sensor wire connections.
1)
2)
▶ Replace the sensor and/or wire connections, if the
problem persists.
1)
A4 Air temperature sensor [18] disconnected or
damaged.
▶ Check sensor wire connections.
1)
2)
▶ Replace the sensor and/or wire connections, if the
problem persists.
1)
A5 Condensing unit flue temperature sensor [16]
disconnected or damaged.
▶ Check sensor wire connections.
1)
2)
▶ Replace the sensor and/or wire connections, if the
problem persists.
1)
A6 Inlet cold water temperature sensor [20]
disconnected or damaged.
▶ Check sensor wire connections.
1)
2)
▶ Replace the sensor and/or wire connections, if the
problem persists.
1)
A7 Heat exchanger hot water temperature sensor
[16] disconnected or damaged.
▶ Check sensor wire connections.
1)
2)
▶ Replace the sensor and/or wire connections, if the
problem persists.
1)
A8 Outlet hot water temperature sensor [17]
disconnected or damaged.
▶ Check connections or replace sensor.
1)
2)
▶ Replace the sensor and/or wire connections, if the
problem persists.
1)
A9 Incorrect output power (too low). ▶ Check gas inlet pressure
1)
( section 4.13).
▶ Check water temperature sensors [17][19][20]
and water flow sensor [14] wire connections.
▶ Check sensors resistance and water flow sensor(
section 11) and replace any if it is not according to
specification.
1)
2)
Table 27
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