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Robertshaw 780-001 ignition module rectangular box with terminals

Robertshaw

Robertshaw 780-001 Ignition Module

SKU CH-V8V2-Z443C

Controls ignition with a 60-second cycle, three retries and a one-minute lock-out between -40 °F and 175 °F

  • TypeLearning Thermostats
  • Operates reliably from -40 °F to 175 °F
  • Three ignition retries before lockout protect the system
  • 60-second ignition cycle ensures prompt startup
  • 5 A main valve output drives gas valves directly
  • 7 mA flame sensor current provides precise flame detection

Robertshaw 780-001 Ignition Module

This Robertshaw 780-001 ignition module is a learning thermostat designed for HVAC systems requiring automatic ignition control. It suits technicians and installers who need a replacement component compatible with universal series equipment. The unit manages ignition sequencing and flame sensing for gas-fired appliances in residential or light commercial settings. It operates reliably across a broad temperature range.

Practical limits of the ignition control

The module functions from -40 Degrees F up to 175 Degrees F, covering extreme ambient conditions. A fixed lock-out time of 1 min follows a failed ignition attempt, and the pre-purge cycle runs for 5 min before each trial. Only three retries are permitted within the 60-second ignition cycle, after which the control locks out. Main valve output is rated at 1.5 A and flame sensor output at 0.7 mA, so connected components must stay within these limits.

Installation and common issues

Wiring follows standard ignition control layouts, making the module straightforward to fit for qualified HVAC personnel. The most frequent problems arise when the flame sensor current falls below 0.7 mA or when the gas valve draws more than 1.5 A, causing nuisance lock-outs. Incorrect pre-purge timing or exceeding the three-retry limit will also prevent normal operation. Always verify supply voltage and sensor placement before powering the system.

Highlights

  • Operates reliably from -40 °F to 175 °F
  • Three ignition retries before lockout protect the system
  • 60-second ignition cycle ensures prompt startup
  • 5 A main valve output drives gas valves directly
  • 7 mA flame sensor current provides precise flame detection

Specifications

BrandROBERTSHAW
TypeLearning Thermostats

Questions about this item

Is the 780-001 a learning thermostat or a basic ignition control?

The product is listed as a Learning Thermostat and an Ignition Control, so it provides adaptive heating logic in addition to managing the ignition sequence.

What does the 175 °F maximum operating temperature mean for my furnace installation?

The module is rated to operate continuously up to 175 °F, so it must be mounted where the ambient temperature stays below that limit during normal furnace operation.

How does the 1.5 A main valve current output limit the gas valves I can use?

The module can supply up to 1.5 A to the main gas valve; any replacement valve must draw 1.5 A or less to avoid overloading the control.

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