Troubleshooting - Bradford White PDV Series Service Manual

Residential & light duty commercial power direct vent models

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Service manual (40 pages)

Service manual (40 pages)

Table Of Contents

Table of Contents

Condensing PDV Series

Observe green LED indicator on

electronic gas control. Error flash codes

are displayed with a three second pause

before repeating. Check and repair the

system as noted in the troubleshooting

table below.

LED Status

Control Status

None, control

No electrical

LED not on or

power.

flashing

Stand-by mode,

Short flash once

every four

waiting for call for

seconds

heat (no fault).

Thermostat

"Heartbeat"

calling for heat

alternates

bright/dim

(no fault).

Weak pilot signal

Short flash once

on last call for

per second

heat.

Pressure switch

Two flash, three

not working –

second pause

closed position.

Pressure switch

Three flash,

or blower temp.

three second

switch not

pause

working – open

position.

Excessive tank

Four flash, three

temperature.

second pause

System must be

reset.

Undesired-false

Five flash, three

pilot flame

second pause

present.

Probable Cause

Control power switch in "OFF" position.

Supply voltage interrupted.

Temperature demand is satisfied.

Tank temperature below set point of

thermostat.

1. Unstable pilot.

2. Pilot tube blocked or restricted.

3. Oxidation build up on pilot electrode.

4. Wire damage to pilot assembly or bad

connection at gas valve.

5. Low gas pressure.

1. Pressure switch tubing kinked or blocked.

2. Blocked pressure tap on switch or blower.

3. Faulty pressure switch.

1. Vent blockage or improper vent

configuration.

2. Pressure switch tubing kinked or blocked.

3. Faulty pressure switch.

4. Blower not spinning up to speed.

5. Blower temp or exhaust temp too high.

6. Faulty blower temperature switch.

1. Temperature sensor out of calibration.

2. Faulty gas control.

3. Plumbing leak.

1. Pilot valve stuck in open position.