Assessments - 4, GPA: 3.3
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If the 425 HN is Powervented, check spill switch reset SPARK APPEARS AT PILOT WHEN HOT WATER TAP TURNEDON,BUTPILOTAND BURNERSWILLNOTIGNITE 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 425 HN A. Gas cock on gas line may not be open B. Gas regulator may be shut or damaged. Replace or unlock the regulator. Note: The regulator furnished with the heater is exclusively designed for low gas pressure. Excessive pressure will lock it up. Locking 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 2 for recommended correct gas pressure. To unlock a regulator, consult your service person. 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 replaced. 4. Pilot electrovalve switch may need to be replaced (See Fig 13). Measure milivoltage at pilot electrovalve (see Fig. 13). 5. Electronic Control Box may need to be replaced (See Fig 13). Check wire connections and test operation of electronic control box (see Fig. 13). 6 720 607 026 PILOT LIGHTS BUT BURNERS WILL NOT COME ON 1. Confirm water valve assembly is working properly. See Water Valve under MAINTENANCE AND SERVICE. 2. Confirm the flame sensor is in its proper position and clean, lightly wipe clean if dirty. See Fig. 10 3. Confirm the burner electrovalve switch is functioning properly. Measure milivoltage at burner electrovalve (see Fig. 13). 4. The Electronic Control Box (Fig. 13) may need to be replaced. Check wire connections and test operation of electronic control box (see Fig. 13). Fig. 13 - Electrical wiring diagram 1 burner electrovalve 8 electronic control box 2 gas control valve 9 LED failure indicator 3 pilot electrovalve 10 LED indicator main 4 flame sensor burner operation 5 pilot electrode 11 on/off switch 6 overheat sensor 12 hydro-generator 7 temperature limiter 13 flue gas safety device MAIN BURNERS GO OUT DURING HOT WATER USE 1. Flow rate diminished below activation rate Increase hot water flow rate. 2. Unbalanced pressure in the water lines The added restriction caused by the 425 HN in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the lower hot water pressure may be overpowered by a much higher cold water pressure, which may cause the 425 HN burners to shut down. Make sure faucet aerators and showerheads are free of minerals and dirt. Do not add any flow restrictor to the shower head. 3. Minimum inlet pressure on well is inadequate Check the inlet water pressure. On a private well, raise the minimum pressure setting to 30 psi. Confirm that the pressure tank is not water logged. 4. ECO (overheat sensor) tripped due to overheating re-ignite the appliance 10 minutes later. If it happens again, contact your service person. 5. Flue gas safety device tripped Ventilate the room and operate the appliance 10 minutes later. Provide more combustion air to the room and/or inspect and correct venting system. Afterwards, if it happens again, contact your service person. WATER IS TOO HOT 1. Temperature Selection too high Turn the temperature adjustment knob counter-clockwise (to the left) to lower the maximum water temperature. Note: This will increase the activation flow rate. 2. Inlet water temperature is too hot (as with solar preheated water or high ground water temperatures) Decrease gas pressure. Note: Only the model 125B LPS or 125B NGS should be used if the inlet water is preheated. 3. Ground water temperature is very warm Reduce inlet gas supply to heater when inlet water temperature is very warm (60-70 F). See also HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED. WATER IS NOT HOT ENOUGH 1. Temperature selection too low. Change the setting. Turn the temperature adjustment knob clockwise (to the right). Note: This will decrease the activation flow rate. 2. Btu input is too low due to insufficient gas pressure It is extremely important for a tankless instantaneous water heater to have the right size gas line to obtain the correct gas pressure See specifications on page 2. Unlike storage tank water heaters, the burners of a tankless water heater must be very powerful to heat water instantaneously since they do this only at the time hot water is actually being used. It is therefore imperative that the gas pressure requirement be met exactly. Insufficient gas pressure will directly affect the water temperature at the time of usage. See page 2 for correct gas pressure settings and fig. 5 for locations where gas pressures are taken. 3. Btu input is too low due to insufficient gas supply...
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