PDX Series
Troubleshooting
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.
Green LED
Indicator
LED Status |
| Control |
|
| Probable Cause |
| Service | ||||||||
|
|
|
|
|
|
|
|
| |||||||
| Status |
|
| Procedure | |||||||||||
|
|
|
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
None, control LED not | No electrical | Control power switch in “OFF” position. | Turn power on | ||||||||||||
on or flashing | power | Supply voltage interrupted. | |||||||||||||
|
|
|
|
| |||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
Short flash, once every |
|
|
|
| Normal operation. | ||||||||||
Waiting for call for | Temperature demand is satisfied | Adjust thermostat to | |||||||||||||
four seconds | heat (no fault). |
|
|
|
|
| temp level | ||||||||
|
|
|
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
“Heartbeat”, alternates | Thermostat calling | Tank temperature below set point of thermostat. | Normal operation. | ||||||||||||
Adjust thermostat to | |||||||||||||||
bright/dim | for heat (no fault). |
|
|
|
|
| temp level | ||||||||
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
| Weak pilot signal | 1. | Unstable pilot. | 1. Page 14 | |||||||||
Short flash once per | 2. | Pilot tube block or restricted. | |||||||||||||
|
|
|
|
| |||||||||||
on last call for | 3. | Oxidation build up on pilot electrode. | |||||||||||||
second | |||||||||||||||
heat. | 4. | Wire damage to pilot assembly or bad | |||||||||||||
|
|
|
|
|
|
|
| ||||||||
|
|
|
|
|
|
| connection at gas valve. |
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
Two flash, three | Pressure switch | 1. | Pressure switch tubing kinked or blocked. | Page 17 | |||||||||||
not working- | 2. | Blocked pressure tap on switch or blower. | |||||||||||||
second pause | |||||||||||||||
closed position. | 3. | Faulty pressure switch. |
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| 1. | Vent blockage or improper vent configuration. | 1. Check vent or vent tables. | |||||||
|
|
| Pressure switch | 2. | Pressure switch tubing kinked or blocked. | ||||||||||
|
|
|
|
|
|
|
| ||||||||
Three flash, three | 3. | Faulty pressure switch. | 2 & 3 Page 17 | ||||||||||||
or blower temp. | |||||||||||||||
4. | Blower not spinning up to speed. |
|
|
|
|
| |||||||||
second pause | switch not working | 4. Page 21 | |||||||||||||
5. | Blower temp or exhaust temp too high | ||||||||||||||
|
|
| 6. | Faulty blower temperature switch. | 5 & 6 Page 23 | ||||||||||
|
|
|
|
|
| ||||||||||
|
|
|
|
|
| 7. | Intake vent length exceeds exhaust vent length. | ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
Four flash, three | Excessive tank | 1. | Thermal well sensor out of calibration. | 1. Page 25 | |||||||||||
temperature. | |||||||||||||||
2. | Faulty gas control. |
|
|
|
|
| |||||||||
second pause | System must be | 2. Replace gas control, | |||||||||||||
3. | Plumbing leak | ||||||||||||||
|
|
| reset. | page 27 | |||||||||||
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
Five flash, three | 1. | Pilot valve stuck in open position. | Replace gas control, | ||||||||||||
pilot flame | |||||||||||||||
second pause | page 27 | ||||||||||||||
present. |
|
|
|
| |||||||||||
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
| Page 12 | |||
12