6 720 817 281 (2017/05)Greentherm 9800 SEO 160/199 | SECO 199
Problem solving | 39
A9 Incorrect output power (too low). ▶ Check gas inlet pressure
1)
( section 6.6).
▶ Check water temperature sensors [17][19][20]
and water flow sensor [14] wire connections.
▶ Check sensors resistance and water flow sensor(
section 13) and replace any if it is not according to
specification.
1)
2)
AA Condensing unit flue gases temperature [16]
above 392 °F and/or flue gases temperature [15]
above 145 °F at the exhaust sensor [15].
Appliance regulates power to protect against
overheating.
▶ Descale appliance ( section 9.3).
1)
C1
C2
Flue blockage detected during startup due to
insufficient combustion air.
▶ Reset error (press and hold on/off button for 3
seconds).
If the problem persists:
▶ Check air openings and exhaust opening for
obstructions and reset the error.
▶ Perform gas and air tuning ( section 10.11).
1)
C3 Flow sensor [14] does not detect water
recirculation.
▶ Check pump and connections.
1)
▶ Check recirculation circuit for any blockage.
C5 Bypass water valve [8] disconnected or damaged. ▶ Check bypass water valve wire connections.
1)
If the problem persists:
▶ Replace the bypass water valve and/or wire
connections.
1)
C7 Fan [2] disconnected or damaged. ▶ Check fan wire connections.
▶ Reset error (press and hold on/off button for 3
seconds)
If the problem persists:
▶ Replace the fan and/or wire connections.
1)
C8 Main water valve [22] disconnected or damaged. ▶ Check main water valve wire connections.
1)
If the problem persists:
▶ Replace main water valve and/or wire
connections.
1)
C9 Barometric pressure sensor damaged. ▶ Reset error (press and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit (ECU).
1)
CA Water flow above 9.2gpm. ▶ Disconnect the appliance and purge hydraulic
circuit to remove air.
1)
▶ Install water flow restrictor.
1)
▶ Check water pressure does not exceed
150psi.(section 3.2).
Display Description Solution
Table 20
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