Guardian PowerVent Training Manual SVC900; Rev 1
Page 20
venting is blocked, then there is no power thru the vacuum safety switch to the control module
and pilot valve. Venting over-temperature switch will be another cause of this failure.
1. Check for rubber vacuum hose and crimping.
2. Verify motor is running.
3. Verify PVC venting is free and clear or all obstructions.
4. Verify termination vent is free and clear of all obstructions.
5. Verify venting does not contain an excessive number of elbows.
6. Verify 120V at the blue #8 wire on the control. If no power, verify 120V at the black wire
on the vacuum switch.
7. Verify vacuum safety switch is operating. Reset heater. Remove black wire from vacuum
switch and measure for 120V. If no 120V, then verify .75 inches w.c. with a magnahelic
gauge. Replace vacuum switch.
8. Verify over-temp safety switch is not open (too hot). If 120V at the black wire on the
vacuum switch, but not at the blue #8 wire position of the control, then over-temp switch
may be tripped. Cool switch to less than 180
0
.
Four (4) Flashes / One (1) Flash - If the control senses the neutral has a potential with respect
to earth ground, it will indicate this failure. On start up and power on, the control module looks
for proper polarity. If polarity is reversed or not present, unit locks out immediately. There will
be no blower motor or ignition attempts.
1. Incorrect polarity at the wall plug or power connection to the water heater.
2. Remove power strip or other GFI circuit and re-try.
Four (4) Flashes / Two (2) Flashes – ECO failure. If the control senses the ECO has opened, it
will indicate this failure. Water temp has exceeded 200
0
F. One time use ECO has tripped. Unit
will cycle 3 times and then lock out with 4/2 flashes. During ignition sequence you will NOT
have power to the yellow #7 wire to the pilot side of the gas valve.
1. Remove red Molex connector from control.
2. Verify continuity thru the red wires of the ECO/Thermistor Molex connector.
3. If there is no continuity, then ECO is tripped. Replace control.
4. If there is continuity, reinstall Molex and reset heater.
Four (4) Flashes / Three (3) Flashes – False flame. Indicated the control is sensing flame with
gas valve “OFF”. The blower will turn on immediately if flame is sensed with the gas valve off.
If there is proof of flame for 10 seconds with the gas valve off, the control will go into lockout.
The blower motor will run during lockout if there is proof of flame. If there is proof of flame for
less than 10 seconds, the unit will post-purge.
Five (5) Flashes – Indicates the thermostat dial is set to its lowest setting – Vacation. There will
be no calls for heat until the water temperature reaches 68
0
F.
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