▶ Field wiring connections and electrical grounding must
comply with local codes, or in the absence of local codes,
with the latest edition of the National Electric Code, ANSI/
NFPA 70, or in Canada, all electrical wiring must comply
with the local codes and the Canadian Electrical Code, CSA
C22.1 Part 1.
Shock hazard: line voltage is present.
▶ Before servicing the water heater, unplug power supply
cord from outlet. Failure to do so could result in severe
personal injury or death.
The water heater requires an electrical power supply from a
120VAC / 60Hz properly rated receptacle and must be properly
The water heater is wired as shown in the wiring diagram
(chapter 10, Fig. 46).
Connecting power supply cord
 Waterproof outlet
 Power cord length: 5.9ft (1.8m).
Note: The power supply that the appliance is plugged into
should be protected from possible water damage. Observe
proper clearance to avoid damages.
Position of the fuses in control unit
To check the fuse, proceed as follows:
▶ Disconnect the appliance from the power supply before
removing the front cover.
▶ Remove the front cover, see fig. 3, page 11.
▶ Remove the two phillips head screws securing the control
▶ Disconnect all the cables from the control unit.
▶ Press the four snaps of the control unit and remove the
▶ Press the four snaps inside the control unit and remove the
▶ Check the fuse on the printed circuit board, for electrical
continuity, see fig. 24, .
▶ After checking the fuse, reinstall all parts in reverse order.
Greentherm T9800 SEO 160/199 | SECO 199 – 6 720 817 281 (2018/12)