Locked Condition - Bosch GWH 715 ES User Manual

Fig. 55 "Program" key
Memorizing selected temperature
B Press buttons or
memorized.
B Hold "Program" button for 3 seconds to save
temperature.
When LCD stops blinking, temperature is saved in
memory.
Using "Program" function
In order to select memorized temperature
6 Maintenance and service
Warning: Always turn off the electrical
power supply, turn off the manual gas
shut off valve and turn off the water shut
off valves whenever servicing.
Caution:
B Check and clean the complete water
heating system once a year.
B Carry out a maintenance overhaul if
necessary. Immediately repair defects to
avoid damage to the system.
Annual maintenance table
1. Inspect venting system
2. Inspect heat exchanger
3. Inspect burner
4. Inspect condensate trap
5. Inspect water filter
Table 15 Annual maintenance
The unit should be checked once a year by a gas
technician. If repairs are needed, the repairs should be
done by a gas technician.
6.1 Annual maintenance
(To remove front cover, see page 6.)
6 720 608 158
to select temperature to be
Every year
X
X
X
X
X
B Press "Program" key.
LCD shows pre-memorized temperature, which is now
the hot water selected temperature.
5.9

Locked condition

This condition is only valid for appliances with one or
more remote controls installed.
Fig. 56 Locked condition
Whenever LCD shows
cannot be adjusted because the appliance is in use by
a user which already selected a different temperature.
Appliance will be automatically unlocked after closing
the hot water tap.
Venting System
• Venting system - inspect inside of flue pipe for any
blockage or restriction. Observe burner flames
during heater operation. (Vent pipe must be
removed). Inspect the combustion air inlet pipe for
blockage or debris. Inspect combustion air and
exhaust terminations for blockage or debris.
Combustion chamber
• Inspect burner observation window (Fig. 67, #10) for
cracks or spillage of flue gases. Observe burner
flames during heater operation. Flames should be
steady and blue with no signs of yellowing. Yellow
burner flames are an indication of improper
combustion. Refer to Section 3.4 & 3.3 of this
manual to ensure that exhaust system and
combustion air supply
specifications.
Pressure relief valve
• Manually open the pressure relief valve to ensure
proper operation.
Inlet water filter
• Verify the inlet filter screen is clean and undamaged.
The inlet water filter is located above the ¾" cold
water inlet on the right side of the appliance (See
Fig. 32, page 26). Close installer supplied cold water
shutoff and supplied water shutoffs, carefully remove
inlet and outlet clips on watervalve. Remove water
vavle to access filter. Clean or replace if damaged.
Descaling
• In areas where the water supply has a high mineral
content (see Table 12, page 26), the heat exchanger
Maintenance and service
the temperature setting
meets manufacturer's
33