John Wood Power Direct Vent (ENERGY STAR) - Manual (Page 31)

VIII) TROUBLESHOOTING GUIDE
Robertshaw 2000N WDER and White-Rodgers Intelli-Vent
TM
SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION
BLOWER WILL NOT
START.
1. No Power to unit.
2. Thermostat setting too low.
3. Defective air pressure
switch (must be open at
start-up before blower is
energized).
4. Defective blower.
5. Disconnected or loose wire.
6. Control locked-out.
1. Plug in power cord, check fuses/supply voltage.
2. Increase thermostat temperature setting.
3. Replace air pressure switch.
4. Replace blower.
5. Repair/reconnect wires.
6. Reset – determine cause of lockout.
BLOWER RUNS
CONTINUOUSLY.
1. Air pressure switch not
closing due to insufficient
draft - check for:
a. vent piping blocked,
b. piping length too long,
c. frozen vent termination,
d. clogged/dirty blower.
2. Disconnected, torn or
blocked pressure sensing
tubing from air pressure
switch to blower housing.
3. Air pressure switch not
closing due to defective
switch.
4. High limit switch open
due to excessive vent
temperature or defective
switch.
1. Determine cause of insufficient draft. Check draft
with manometer at pressure switch (refer to Table 3
for minimum acceptable draft settings).
a. remove blockage,
b. reduce vent length/increase vent size,
c. clear termination of snow/ice,
d. clean blower wheel.
2. Reconnect or replace pressure sensing tubing.
3. Replace defective pressure switch.
4. Determine cause of overheating check for: overfiring,
insufficient air supply, high ambient air temperature
(once activated high limit must be replaced).
HOT SURFACE IGNITER
NOT GLOWING
FOLLOWING WARM-UP
PERIOD
1. 120VAC polarity reversed at
120VAC outlet receptacle.
2. Defective hot surface
igniter.
3. Defective Control.
1. Reverse polarity at 120VAC outlet receptacle.
2. Replace igniter (Check for 120VAC across I1 & I2,
Robertshaw only).
3. Replace control.
CONTROL LOCKED-OUT.
1. No gas supply.
2. Gas control switch in “OFF”
position.
3. Insufficient gas supply.
4. Incorrect manifold gas
pressure.
5. Incorrect gas type.
6. Defective igniter/loose or
disconnected wire.
7. Improperly positioned, dirty,
or defective flame rod/loose
or disconnected wire.
8. Burner orifice clogged.
9. Blocked water heater flue.
10. Defective control.
1. Check/turn on gas supply.
2. Turn control switch to “ON” position (Robertshaw
only).
3. Ensure correct supply pressure for gas type (Nat
Gas 7.0 in. w.c. (1.74 kPa)) (Propane 11.0 in. w.c.
(2.74 kPa)).
4. Check/adjust for correct manifold gas pressure (NG
3.5 in. w.c.(0.87 kPa)), (Propane 10.0 in. w.c. (2.49
kPa)).
5. Ensure correct gas type for water heater model.
6. *Replace defective igniter/reconnect wiring.
7. *Reposition, clean, or replace defective flame rod/
reconnect wiring.
8. Remove obstruction.
9. Remove blockage/clean flue.
10. Replace Control.
* See Figure 26.
CONTROL LOCKED-OUT.
*SOLID GREEN LED.
1. Internal control fault.
2. ECO failure – excessive
water temperature.
3. Excessive humidity/damp
environment.
1. Replace control.
2. Replace control.
3. Allow control to dry.
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