Troubleshooting, Check rollout limit | Goodman Mfg CPG SERIES

AUTOMATIC RESET HIGH LIMIT CONTROL (ALS)

Located in the blower compartment on the blower housing, it senses air temperature within the blower compartment and protects the filters from excessive temperature. It will shut down the furnace if it senses excessive temperatures.

MANUAL RESET FLAME ROLLOUT CONTROL (RS)

Located in the burner compartment at the top of the burner assembly, it senses high temperature that could occur if the heat exchanger tubes were plugged and the flame was roll- ing out instead of entering the tubes. It has a manual push- button reset that cannot be actuated until the limit control has cooled.

TROUBLESHOOTING

IGNITION CONTROL ERROR CODES

The following presents probable causes of questionable unit operation. Refer to Diagnostic Indicator Chart for an inter- pretation of the signal and to this section for an explanation.

Remove the control box access panel and note the number of diagnostic LED flashes. Refer to Diagnostic Indicator Chart for an interpretation of the signal and to this section for an explanation.

ABNORMAL OPERATION - HEATING

Internal Control Failure

If the integrated ignition control in this unit encounters an in- ternal fault, it will go into a “hard” lockout and turn off the diagnostic LED. If diagnostic LED indicates an internal fault, check power supply to unit for proper voltage, check all fuses, circuit breakers and wiring. Disconnect electric power for five seconds. If LED remains off after restoring power, re- place control.

External Lockout

An external lockout occurs if the integrated ignition control determines that a measurable combustion cannot be estab- lished within three (3) consecutive ignition attempts. If flame is not established within the seven (7) second trial for igni- tion, the gas valve is deenergized, 15 second inter-purge cycle is completed, and ignition is reattempted. The control will repeat this routine three times if a measurable combustion is not established. The control will then shut off the induced draft blower and go into a lockout state.

If flame is established but lost, the control will energize the circulator blower at the heat speed and then begin a new ignition sequence. If flame is established then lost on subse- quent attempts, the control will recycle for four (4) consecu- tive ignition attempts (five attempts total) before locking out.

The diagnostic fault code is 1 flash for a lockout due to failed ignition attempts or flame dropouts. The integrated control will automatically reset after one hour, or it can be reset by removing the thermostat signal or disconnecting the electri- cal power supply for over five seconds. If the diagnostic LED indicates an external lockout, perform the following checks:

•Check the supply and manifold pressures

•Check the gas orifices for debris

•Check gas valve for proper operation

•Check secondary limit

A dirty filter, excessive duct static, insufficient air flow, a faulty limit, or a failed circulator blower can cause this limit to open. Check filters, total external duct static, circulator blower motor, blower motor speed tap (see wiring diagram), and limit. An interruption in electrical power during a heating cycle may also cause the auxiliary limit to open. The automatic reset secondary limit is located on top of the circulator blower assembly.

•Check rollout limit

If the burner flames are not properly drawn into the heat exchanger, the flame rollout protection device will open. Possible causes are restricted or blocked flue passages, blocked or cracked heat exchanger, a failed induced draft blower, or insufficient combustion air. The rollout protection device is a manual reset limit located on the burner bracket. The cause of the flame rollout must be determined and corrected before resetting the limit.

•Check flame sensor

A drop in flame signal can be caused by nearly invisible coating on the sensor. Remove the sensor and carefully clean with steel wool.

•Check wiring

Check wiring for opens/shorts and miswiring.

IMPORTANT: If you have to frequently reset your gas/electric package unit, it means that a problem exists that should be corrected. Contact a qualified servicer for further information.

Pressure Switch Stuck Open

A pressure switch stuck open can be caused by a faulty pres- sure switch, faulty wiring, a disconnected or damaged hose, a blocked or restricted flue, or a faulty induced draft blower.

If the control senses an open pressure switch during the pre- purge cycle, the induced draft blower only will be energized. If the pressure switch opens after ignition has begun the gas valve is deenergized, the circulator blower heat off cycle be- gins, and the induced draft blower remains on. The diagnos- tic fault code is two flashes.

Pressure Switch Stuck Closed

A stuck closed pressure switch can be caused by a faulty pressure switch or faulty wiring. If the control encounters a pressure switch stuck closed, the induced draft blower re- mains off. The diagnostic LED code for this fault is three (3) flashes.

CPG SERIES specifications

Goodman Manufacturing has long been a trusted name in the HVAC industry, known for delivering reliable and efficient heating and cooling solutions. Among its impressive lineup is the CPG series, a collection of packaged units that cater to a wide range of residential and commercial applications. The CPG series is designed with the latest technologies and features, making it an ideal choice for those seeking comfort and performance.

One of the most significant characteristics of the CPG series is its energy efficiency. Engineered to meet rigorous energy standards, these units utilize advanced refrigerant technologies that not only lower energy consumption but also contribute to reducing environmental impact. The high-efficiency scroll compressor within the CPG series is designed to operate quietly and smoothly, ensuring that homeowners enjoy a comfortable indoor environment without disruptive noise.

The CPG series also stands out with its robust construction. Each unit is crafted from durable materials that can withstand various weather conditions, ensuring longevity and reliability. The all-aluminum evaporator coil enhances corrosion resistance, prolonging the unit's lifespan and maintaining optimal performance throughout its operation.

In terms of features, the CPG series offers an integrated microprocessor control system that optimizes performance based on real-time environmental data. This smart technology allows for accurate temperature control and improved efficiency by adapting to changing conditions. Furthermore, the series provides multiple capacity options, making it flexible for various building sizes and requirements.

Ease of installation and maintenance is another hallmark of the CPG series. These packaged units are designed for quick setup, reducing labor costs and installation time. Additionally, the access panels on the units are strategically placed, facilitating easier maintenance and servicing. This advantage not only enhances user convenience but also ensures that the units operate efficiently for years to come.

Moreover, the CPG series supports various accessories and enhancements, such as advanced filtration systems and programmable thermostats, allowing users to customize their HVAC system based on specific needs and preferences.

In conclusion, the Goodman CPG series embodies a perfect blend of efficiency, durability, and technology. With its focus on energy savings and user-friendly design, it represents a sound investment for those seeking superior HVAC solutions for their homes or commercial spaces. Whether it's for new construction or an upgrade to an existing system, the CPG series offers performance and reliability that customers can depend on.