Brand: Generic
Category: Home HVAC System
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Manual for ZGA SERIES - Troubleshooting and error codes + PDF Download
Uploaded: April 1, 2025, 12:48 a.m.
Manual Publish Date: 2016-02
Warranty Summary
No warranty information provided in this manual.
Heating Start-up:
- Set thermostat to HEAT.
- Ignition control checks safety circuits.
- Combustion air inducer purges exhaust.
- Ignition control activates gas valve and spark.
- Flame is sensed, blower starts after delay.
Cooling Start-up:
- Set thermostat to COOL.
- Compressor and condenser fan are energized.
- For economizer units, outdoor air is used if suitable, otherwise, compressor runs.
- Blower operates to circulate cooled air.
Troubleshooting and error codes
| LED | STATUS |
|---|---|
| Slow Flash | Normal operation. No call for heat. |
| Fast Flash | Normal operation. Call for heat. |
| Steady Off | Internal Control Fault, No Power To Board or Gas Valve Relay Fault |
| Steady On | Control Internal Failure. |
| 2 Flashes | Lockout. Failed to detect or sustain flame. |
| 3 Flashes | Rollout switch open / Prove switch open or closed. |
| 4 Flashes | Primary High Limit switch open. |
| 5 Flashes | Flame sensed but gas valve not open. |
Troubleshooting and error codes
| LED | STATUS |
|---|---|
| Slow Flash | Normal operation. No call for heat. |
| Fast Flash | Normal operation. Call for heat. |
| Steady Off | Internal Control Fault, No Power To Board or Gas Valve Relay Fault |
| Steady On | Control Internal Failure. |
| 2 Flashes | Lockout. Failed to detect or sustain flame. |
| 3 Flashes | Rollout switch open / Prove switch open or closed. |
| 4 Flashes | Primary High Limit switch open. |
| 5 Flashes | Flame sensed but gas valve not open. |