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Troubleshooting
57
Greentherm T9800 SE 160/199 – 6 720 816 815 (2022/01)
▶ Reconnect the electrical supply to the unit, open the water
shutoff valves, and return the unit to service.
Fig. 51
[1] Pump
[2] Water filter
8Troubleshooting
WARNING:
▶ If you are unable to perform the tasks listed below, or need
additional assistance please contact a service provider or
contractor.
NOTICE:
In some areas local code may require that the tasks described
in this section must be performed by a certified contractor.
▶ Please check your local codes to ensure compliance.
8.1 Introduction
Many of the questions customers ask regarding operation of
this unit can be answered by following the troubleshooting
steps as outlined below. For best results, perform each step
before proceeding to the next. The suggested solutions may
require that the cover be taken off (see fig. 3, page 12).
8.2 Burner does not ignite when a hot water
faucet is opened
It is recommended to use “P4 Information” page 47, chapter
6.5.1 as a tool for problem solving.
1. If the display is blank, verify power at the outlet. (120VAC/
60Hz properly grounded circuit required). Confirm power
to the heater. Check all wire connections including plugged
connectors.
2. Verify if the fuse in the control board is good. To access the
fuse, the control board must be removed. See chapter 5.2,
page 44.
3. Make sure cold water inlet connection is plumbed to the
right side of the heater when facing unit. See fig. 28,
page 38.
4. A minimum of 0.45 gallons per minute (1.7 l/m) of hot
water demand is required to activate the heater. Confirm at
least 0.4 gpm flow by timing how long it takes to fill a
container. A quart container should fill in 20 seconds or
less, from the hot water faucet only. Gradually increase
water flow (hot water demand) through the heater to
determine if the heater activates with higher flow.
5. Clean the inlet water filter screen per chapter 4.10,
page 37.
6. Inspect the water path for obstructions. Make sure all
shower heads, faucet aerators and whole house filters are
clear of debris.
7. Check for a plumbing crossover. A crossover in the hot and
cold plumbing pipes creates back pressure on the water
flowing through the heater. Therefore, a higher flow rate
than normal is needed to force the heater to activate. To
check for a plumbing crossover, shut off the cold water
supply to the water heater. Then open all of the hot water
faucets served by the water heater. Wait 10 minutes and
check for water flow at each faucet. There should be no
water flowing. Any continuous flow of water, small or large,
indicates a crossover is present and must be corrected.
Consult a professional plumber for help in correcting a
crossover. Failing single lever faucet mixing valves are
common causes of plumbing crossovers.
8. With the water heater's power supply cord unplugged,
remove the unit's front cover (See fig. 3, page 12). Check
all wire connections between the water valve/water flow
sensor, control unit and electrode set. See chapter 63,
page 70.
8.3 Water is too hot
1. Selected temperature on the unit is too high. To lower
output temperature, see chapter 6.4, page 45.
2. Confirm the heater's gas type coincides with the type of gas
being supplied. See fig. 2, page 12 for location of rating
plate.
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