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
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
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 |
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|
|
|
|
|
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
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
5.Pilot electrovalve switch may need to be replaced (See Fig 17).
Call your service person or call: Canada
6.Electronic Control Box may need to be replaced, (See Fig 17).
Call your service person or call: Canada
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