John Wood Power Vent (Non-ENERGY STAR qualified models) - Manual (Page 26)

Note: All the temperature indicators will be off during normal
operation. If any time you see the indicators on, there may
be a system error and you should consult the
“Troubleshooting” section of this document, or contact a
trained service professional.
There is a hot-water scald potential if the thermostat is set
too high. In households with children, disabled or the elder-
ly, select a lower temperature setting. Valves for reducing
point-of-use temperature by mixing hot and cold water are
available. Consult a licensed plumber or the local plumbing
authority.
Heater Shutdown
1.
Turn off all electrical power to the heater or unplug the
power cord from the receptacle.
2. Turn the manual gas supply valve to the water heater to
the “OFF” position.
System Error Codes
The computer inside the gas control monitors the flammable
vapour safety features, the ignition sequence, temperature
settings and overall operation of the heater. If any of these
parameters does not operate properly the computer will
shut down the water heater and flash an error code. See the
“System Error Codes (White-Rodgers)” and
“Troubleshooting Guide (White-Rodgers)” to diagnose the
problem before attempting corrective action. See also
“Flammable Vapour Sensor” and “Resettable Lockout”.
– 26 –
WARNING
Scald burns occur in under one second with
71°C (160°F) water, which this thermostat will
deliver if the temperature is set at “VERY
HOT”. Lower settings of the temperature will
reduce the risk of scald and will reduce your
fuel bill.
SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION
An open earth ground circuit to
the ignition system. 1. Check that the earth ground conductor is properly connected at the
fuse box or breaker panel and the water heater.
2. Check that the grounding conductors on the water heater are prop-
erly connected and secure.
The self diagnostic test detect-
ed a wiring error, reversed
polarity or a high resistance to
earth ground. 1. Check for proper connection of the line neutral and line hot wires.
2. Check that the appliance is securely connected to earth ground.
Error 1
Error 2
Error 3
Error 4
Error 5
Error 6
The pressure switch remained
closed longer than 5 seconds
after the call for heat began.
Blower does not start. 1. The pressure switch wiring is incorrect.
2. The pressure switch is defective and must be replaced.
The pressure switch remained
open longer than 5 seconds
after the combustion blower
was energized. 1. The pressure switch wiring is incorrect.
2. The pressure switch tubing is not connected correctly.
3. Obstructions or restrictions in the water heater air intake or exhaust
flue.
4. Check the high temperature limit switch.
The maximum number of igni-
tion retries or recycles has
been reached and the system
is in lockout for an hour. Cycle
the power to the water heater
off and on to reset. 1. Ensure the igniter is positioned correctly.
2. Ensure the voltage to the water heater is 115-125 VAC.
3. Clear any obstructions or restrictions in the water heater air intake
or exhaust flue.
The self diagnostic test has
detected an error in the hot-
surface igniter circuit. 1. Check that all wiring is correct and secure.
2. Disconnect the igniter connector and measure the igniter resistance
with an accurate ohmmeter between pins 1 and 2. Resistance
should be between 11.5 and 18.8 ohms. If the reading is incorrect,
replace the hot-surface igniter.
3. If the above checks are good, replace the control.
Intelli-Vent TM System Error Codes
Table 5 Intelli-Vent TM System Error Codes.