Bosch GWH 1600 P LP Specifications download pdf (Page 20)

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Troubleshooting

6 Troubleshooting

6.1 Introduction

Many of the questions customers ask regarding

operation of this unit can be answered by following the

troubleshooting steps as outlined below. Visit our web

site at www.boschhotwater.com for more detailed

troubleshooting. For best results, perform each step

before proceeding to the next. The suggested solutions

may require that the cover be taken off. (See chapter

3.4).

6.2 Pilot does not light

1. Verify gas supply is on at Natural Gas meter or

Propane Tank. Make sure all manual gas shut off valves

are in the open position. Have licensed gas technician

confirm adequate gas pressure at the inlet tap

(chapter 3.8). If gas is not present, verify manufacturer

supplied Maxitrol regulator is in the upright position. The

arrow on the back of the regulator must point in the

same direction as gas flow.

2. If the unit was just installed or the gas lines have been

worked on, there may be air in the gas line. Push in the

pilot button while pushing the pilot igniter button every

few seconds. It may take several minutes to bleed air

out of the gas line.

3. Verify a spark is being thrown at pilot area while pilot

button is being firmly depressed. Repeatedly push in

pilot igniter button to light the pilot. If no spark is

present, verify proper wire connection to the electrode.

4. Pilot assembly may be blocked. Clean or replace the

pilot orifice (chapter 5.3).

6.3 Pilot lights, but goes out when

button released

1. When lighting pilot ensure the pilot button is fully

depressed and held in for at least 20 seconds after pilot

is lit.

2. Verify gas type indicated in rating sticker located on

right hand side of cover, coincides with the gas type you

are using. NG is a natural gas unit and LP is for liquid

propane.

3. If using a power vent, check the safety spillage switch

reset button (the safety spillage switch is wired through

the water heater's thermocouple circuit). The spill

switch should be mounted at the top of water heater on

the draft diverter (Consult power vent manual for

location).

4. Check all connections of the pilot safety circuit. The

pilot safety circuit consists of a thermocouple, overheat

sensor (ECO), safety spillage switch(models with

power vents only) and the electromagnet (See parts

diagram for locations). Clean sensor connections with

light sandpaper if corrosion is evident. The

electromagnet connection is 5mm nut from the

thermocouple which screws into a larger 24mm nut.

Tighten both nuts snugly but do not over tighten.

5. Pilot flame should be blue in color and completely

engulfing the tip of the thermocouple. If not, have a

licensed gas technician verify gas pressure is in

accordance with manufacturer's specifications (see

chapter 3.8) and clean or replace the pilot orifice (see

chapter 5.3).

6. Have a licensed gas technician verify the proper

operation of the thermocouple by measuring the

millivoltage from the thermocouple lead to ground. The

proper reading should be 24mVDC or greater. If the

reading is lower and the pilot is engulfing the

thermocouple tip, the thermocouple may be defective.

Call Bosch Water Heating for further instruction.

6.4 Pilot goes out during or after hot

water use

1. Pilot outage during use typically results from the

unit's safety overheat/high limit sensors interrupting the

pilot circuit.

2. Failure to vent properly by reducing pipe diameter,

improper use of elbows or not meeting required vent

length are common causes that deactivate the pilot

safety circuit. Confirm venting is in accordance with

manufacturer's specifications (see chapter 3.6).

3. Confirm the combustion air requirements are being

met in accordance with manufacturer's specifications

(see chapter 3.5). Proper venting and combustion air

will ensure a proper draft.

4. Confirm that the burners in the water heater go off

immediately when the hot water is turned off. If they

remain on or shut down slowly, then the overheat

sensor (ECO) will interrupt the pilot circuit and shut off

all gas to the heater. The water valve assembly, which

actuates the burners, may be dirty and requires periodic

maintenance (every 2 - 5 years depending on water

quality and use) (see chapter 5.2).

5. Check all connections of the pilot safety circuit. The

pilot safety circuit consists of a thermocouple, overheat

sensor (ECO), safety spillage switch (models with

power vents only) and the electromagnet (See parts

diagram for locations). Clean sensor connections with

light sandpaper if corrosion is evident. The

electromagnet connection is 5mm nut from the

thermocouple which screws into a larger 24mm nut.

Tighten both nuts snugly but do not over tighten.

6. Verify pilot is a steady blue flame that completely

engulfs the thermocouple tip. If pilot flame is too small,

clean pilot orifice (see chapter 5.3).

7. If the water has a high mineral content, the heat

exchanger may be scaled internally. This restricts the

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Bosch GWH 1600 P LP Specifications Page 20

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