Bosch Appliances WR430-3K manual No Spark AT the Pilot, Adjusting Screw, Stops sparking

NO SPARK AT THE PILOT

1. ON/Off switch is not “On” (Position I).

The On/Off switch is located behind the flipdown cover plate on the front panel strip. See fig. 10.

2. Water flow is not sufficient to activate heater.

Water flow rate at faucet is below minimum flow needed to activate heater. When temperature adjustment knob is turned all the way clockwise, the Bosch WR430-3K requires 1/2 gallon per minute flow to activate the heater. As a reference, this is a flow which would fill a quart jar in 30 seonds. If the temperature adjustment knob is turned fully counterclockwise, a flow rate of 1.1 gallons/minute is required to activate the heater.

3. Water inlet filter is clogged

Water flow is restricted, preventing needed flow to activate heater. Clean water inlet filter screen.

4. Cross over in water lines

To confirm there is no cross-over in the plumbing, shut off the cold water supply to the Bosch water heater and open a not water faucet. There should not be any water flowing at that faucet. Water running is a sign of a plumbing cross over. Consult your plumber.

5. Microswitch needs to be adjusted or replaced.

If you do not hear a click when a tap is opened, the microswitch needs to be adjusted. See Fig 15 for adjustment. Replace the microswitch if the adjustment does not solve the problem.

Fig. 15 - Microswitch Adjustment

ADJUSTING

SCREW

Pilot does not spark with		Pilot is always sparking
water flow		without water flow
1	Close water tap	1	Close water tap
2	Remove screw cap and	2	Screw in adjusting screw, till it
	unscrew adjusting screw til		stops sparking
	sparking starts	3	Continue to screw in turning
3	Screw in turning one and		one and a half turns more
	half turns more
4	Replace screw cap

7.Cold incoming water connection made to wrong side of heater

Make sure cold water inlet connection is on the right side of heater when you are facing heater.

8.Water valve parts may be dirty of components damaged First check that venturi is free of dirt particles. Water valve and component parts must be totally free of dirt. In hard water areas, mineral deposits can eventually (3-5 years in hard water areas) corrode the water valve parts to a point where they will need replacing. Any sign of moisture at the top of the water valve is a sign that the water valve needs to be serviced immediately.

9.Loose connection at the ECO

Ignition sparker will not operate if the electrical circuit is interrupted. Check that the connections to the ECO are secure and tighten if necessary.

SPARKS APPEAR AT PILOT WHEN HOT WATER TAP TURNED ON, BUT PILOT AND BURNERS WILL NOT IGNITE

1. Air in the Gas Line

Normally this is a problem at time of initial installation, after the pipes have been worked on, or after a gas supply line has been allowed to empty. Bleed the air trapped in the gas line by turning the hot water faucet on and off until the air has been cleared from the line.

2. No gas to the Bosch

A. Gas cock on gas line may not be open

B. Gas regulator may be shut or damaged. Replace or unjam the regulator. Note: The regulator furnished with the heater is exclusively designed for low gas pressure. Excessive pressure will lock it up. Jamming usually happens when using propane gas if the gas pressure between the gas tank and the water heater’s gas regulator has not been reduced. See Page 14 for recommended correct gas pressure. To unjam a regulator, consult your gas supplier.

3. Pilot orifice or gas valve is dirty

Clogging of the pilot burner can be caused by dust in the air or dirt in the gas. The pilot orifice or gas filter may need to be cleaned or replace.

4. Water valve assembly needs to be checked

If the pilot orifice is clean, the water valve assembly should be checked. The adjustment screw on the water valve micro- switch may not be tight enough (Fig. 15). Remove central cap beneath micro-switch assembly, carefully loosen the adjustment screw until the pilot light ignites. At that point retighten the screw one and a half turns.

5.Pilot electrovalve switch may need to be replaced (See Fig 17).

Call your service person or call: Canada 1-800-663-8405, U.S.A. 1.800-824-7337.

6.Electronic Control Box may need to be replaced, (See Fig 17).

Call your service person or call: Canada 1-800-663-8405, U.S.A. 1.800-824-7337.

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