Bosch Greentherm T9800 SEC 199 - Page 61

6 720 816 815 (2018/08)Greentherm T9800 SE 160/199 | SEC 199
Problem solving | 61
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 7.3).
1)
BB Fan calibration triggered due to missed ignitions. ▶ Check gas inlet pressure ( section 4.13).
1)
▶ Perform gas and air tuning ( section 8.11).
1)
BC Successive fan calibration with similar learned
values.
▶ Check gas inlet pressure ( section 4.13).
1)
▶ Perform gas and air tuning ( section 8.11).
1)
C1
C2
Flue blockage detected during startup due to
insufficient combustion air.
▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Check air intake and exhaust pipes and terminals for
obstructions and reset the error.
▶ Check if flue length is according to specification
(section 4.6) and reset the error.
▶ Perform gas and air tuning ( section 8.11).
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. After valve replacement, proceed with
bypass water valve calibration (section 6.7).
1)
C7 Fan [2] disconnected or damaged. ▶ Check fan wire connections.
▶ Reset error (touch 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)
▶ Proceed with main water valve calibration.
If the problem persists:
▶ Replace main water valve and/or wire connections.
After valve replacement, proceed with main water
valve calibration (section 6.7).
1)
C9 Barometric pressure sensor damaged. ▶ Reset error (touch 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 27