What BTU sizes does the Raypak Digital Low NOx ASME 207A-407A come in?

The Raypak Digital Low NOx ASME 207A-407A is available in 199,500 - 399,000 BTU/hr.

What voltage does the Raypak Digital Low NOx ASME 207A-407A require?

The Raypak Digital Low NOx ASME 207A-407A operates on 120/240 VAC.

What are the common error codes on the Raypak Digital Low NOx ASME 207A-407A?

Common error codes include: Sensor Failure / Sensor Open / Sensor Short, Water Sw Open, Hi Limit 1 Fault / Hi Limit 2 Fault, Ignition Lockout, Ignition Failure. See the troubleshooting section for details on each.

Raypak Digital Low NOx ASME 207A-407A Specs, Parts & Error Codes

Specifications

Heating
BTU Range	199,500 - 399,000 BTU/hr
Gas Type	Natural Gas
Gas Inlet Connection	3/4 in. NPT
Electrical
Voltage	120/240 VAC
Phase	Single phase
Frequency	60 Hz
Performance
Min Flow (GPM)	20 GPM
Max Flow (GPM)	100 GPM
Temperature Range	32-175 F
Certifications
CSA Certified	Yes

Pros & Cons

Pros

ASME Low NOx variant with manual-backed diagnostics and service menu.
Manual includes status/fault messages, control logic, troubleshooting, wiring, and parts.
Covers 207A, 267A, 337A, and 407A models.

Watchouts

Confirm ASME and Low NOx configuration before using parts from non-ASME Digital heaters.
Some limits and switches are manual reset on ASME units.
Combustion and gas service should be handled by qualified technicians.

Error Codes & Troubleshooting

Sensor Failure / Sensor Open / Sensor Short

Temperature sensor out of range. Inspect thermistor, wires, and connector at Terminal P1. Check resistance against chart values. Replace thermistor if not within 10%; if okay, replace the circuit board.

Water Sw Open

Water flow or pressure switch issue. Verify water flow and pressure, and clean the filter/strainer before replacing the switch.

Hi Limit 1 Fault / Hi Limit 2 Fault

High limit switch open. Verify water flow and inspect the internal thermostat and bypass valve. ASME units are manual-reset — press MODE to reset.

Ignition Lockout

Pilot flame not established, or lost during trial for main burner. Check power at the pilot valve, check for spark, and verify pilot orifice and igniter clearance.

Ignition Failure

Gas supply or valve operation issue. Verify gas is reaching the heater and confirm valve operation.

Replacement Parts

Part	Part Number	Description
105°F U.G. Service Kit (206-207, 266-268)	`018759F`	Manual-recommended kit for harmonics/whining noise after basic checks (debris, restriction, low flow/scale) don't resolve it.
105°F U.G. Service Kit (336-337, 406-408)	`018758F`	Manual-recommended kit for harmonics/whining noise after basic checks (debris, restriction, low flow/scale) don't resolve it.

Digital Low NOx ASME 207A-407A

Specifications

Pros & Cons

Pros

Watchouts

Error Codes & Troubleshooting

Replacement Parts

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