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Troubleshooting
Greentherm T9800 SE 160/199 – 6 720 816 815 (2022/01)
60
▶ Connect the pressure gauge "-" to the pressure head point
[A] using the accessory [C].
▶ Turn On the appliance.
▶ Position the front cover near the appliance and make sure
the cable for the display is connected.
▶ Open all hot water faucets to achieve a flow rate of at least
6 gallons per minute. (1 tub and 2 sinks should be
sufficient). If heater goes back to P2, open more hot water
fixtures to allow sufficient flow and access to P1 menu.
▶Record the manifold gas pressure reading in table 23.
Manifold gas pressure refers to the relative pressure
between gas manifold nozzles inlet and outlet [A]-[B].
Table 23
▶ Turn Off the appliance.
▶ Disconnect the pressure gauges from the pressure heads
points [A] and [B].
▶ Tighten the shutter screws of the pressure heads points [A]
and [B].
▶ Reassemble the front cover onto he appliance.
▶ Turn ON the appliance to return to normal operation.
8.11 Gas and Air Adjustment
Appliance is pre-adjusted from factory.
Gas/Air adjustments are only required when;
• The appliance is converted to LPG ( section 6.8).
• The appliance shows repeated unresolved errors (
chapter 9).
• After the replacement of the electronic control unit, fan or
gas valve.
The gas and air adjustment can be completed in two ways:
•Automatic <UC - Auto Adjust> ( section 8.11.1).
•Manually <MA - Manual Adjust> ( section 8.11.2).
Improper gas pressure will affect combustion.
▶ Please see chapter 4.13 for more information.
Access to CA Combustion Adjust menu is only possible after
accessing to AU Technical Settings menu ( section 6.6).
After enter AU Technical Settings menu,
▶ Touch symbols or to select CA menu.
Display shows CA Combustion Adjust.
▶ Touch the symbol to enter CA menu.
• UC - Auto Adjust
• MA - Manual Adjust
• ...
Fig. 53 CA Combustion Adjust
8.11.1 Automatic Gas and Air adjustment
The UC Auto Adjust is the automatic Gas and Air adjustment
process. This process takes approximately 15 minutes, and
does not requires any intervention
besides insuring that
enough water flow is provided to the appliance.
To perform UC Auto Adjust of Gas/Air flow;
After enter CA Combustion Settings menu,
▶ Touch symbols or to select UC menu.
▶ Touch the symbol to enter UC menu.
Automatic adjustment has initiated.
Fig. 54 Auto Adjustment
Value Date
Manifold gas
pressure
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