OWNER’S MANUAL

TROUBLESHOOTING

Note: For additional help, visit DESA International’s technical service web site at www.desatech.com.

Note: All troubleshooting items are listed in order of operation.

WARNING: Turn off and unplug furnace and let cool before servic- ing. Unless you need gas supply for testing, shut off equipment shutoff valve before servicing. Only a qualified service person should service and repair furnace.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

No heat

1.

Thermostat off

1. Check to be sure thermostat is calling for heat.

 

 

 

 

Wire to thermostat could be off terminal

 

2.

Gas supply

2. Be sure equipment gas valve is in the open posi-

 

 

 

 

tion (level or parallel to gas line)

 

3. Electrical connections and power

3. Be sure all electrical connections are secure

 

4.

Motor

4.

Motor must be operating at top speed before

 

 

 

 

burner will come on. If blower is not operating

 

 

 

 

at top speed, check voltage supply (minimum

 

 

 

 

100 volts A.C.). If voltage supply is okay, check

 

 

 

 

for defective motor

 

5.

Malfunctioning microswitch

5. Be sure the microswitch is sailing in far enough

 

 

 

 

to open the solenoid valve and to energize the

 

 

 

 

ignition control. If the switch is not sailing in,

 

 

 

 

clean any dust or dirt from the actuator pin. Other

 

 

 

 

reasons for the switch not sailing in are

 

 

 

 

A. Insufficient blower speed - Slow motor due to

 

 

 

 

faulty motor or lint and dust accumulation on

 

 

 

 

the blower wheels or restriction of return air to

 

 

 

 

the furnace

 

 

 

 

B. Faulty microswitch - Replace switch if cir-

 

 

 

 

cuit to ignition control is not completed when

 

 

 

 

switch is manually engaged. Switch should

 

 

 

 

also be replaced if blower motor running at

 

 

 

 

top speed fails to engage switch within six or

 

 

 

 

seven seconds. Note: To service switch, com-

 

 

 

 

bustion chamber must be pulled out. Follow

 

 

 

 

steps 1, 2, 3, 9 and 10 on page 8 to remove

 

 

 

 

combustion chamber

 

6.

Gas valve

6.

Within 20 seconds after motor reaches 75% of

 

 

 

 

its r.p.m. and microswitch engages, check the

 

 

 

 

following:

 

 

 

 

A. Voltage at valve - If current is present but

valve is not opening, check wire connections B. If wire connections okay - Replace valve C. No voltage at valve - Check circuit completion

through microswitch and limit switch as well as wiring and wire connections. If no defects are found, see Ignition Failures, page 16

www.desatech.com

Continued

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Desa DNV40PB, DNV25PB installation manual Troubleshooting, Observed Problem Possible Cause Remedy
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DNV40PB, DNV25PB specifications

Desa DNV25PB and DNV40PB are two advanced models in the range of DNV portable heaters renowned for their efficiency and innovative technology. These heaters are designed to provide reliable and effective heating solutions for various applications, from industrial settings to outdoor events.

One of the standout features of the DNV25PB and DNV40PB models is their robust construction, making them suitable for rigorous work environments. Both models are built with high-quality materials that ensure durability and resilience even in challenging conditions. This makes them an ideal choice for industries such as construction, warehouses, and agriculture, where reliable heating is essential.

The performance of the DNV heaters is enhanced by their powerful heating capacity. The DNV25PB model can deliver an impressive output of 25 kW, while the DNV40PB model boasts a strong 40 kW output. This substantial heating capability allows them to heat large spaces quickly and efficiently, providing comfort in less time and reducing energy costs. Additionally, both models come equipped with adjustable heating settings, allowing users to tailor the output to meet their specific needs.

These heaters incorporate advanced technologies that prioritize energy efficiency and safety. They are designed with smart control systems that monitor and adjust the heater's operation, optimizing fuel consumption while delivering consistent heat. Furthermore, safety features such as automatic shut-off mechanisms and overheating protection devices are integrated into both models, ensuring safe operation even in extended use.

Portability is another significant characteristic of the DNV25PB and DNV40PB models. Their compact design, coupled with built-in handles and wheels, allows for easy transport between different sites, making them highly versatile. Users can effortlessly relocate the heaters to adapt to changing conditions or requirements, enhancing their practicality.

In summary, the Desa DNV25PB and DNV40PB portable heaters are characterized by their powerful heating capabilities, robust construction, energy efficiency, and safety features. They are well-suited for various industrial and outdoor applications, offering flexibility and reliable performance. With their innovative technology and thoughtful design, these models stand out in the market, providing effective heating solutions to meet diverse needs. Whether for temporary heating at a construction site or providing warmth for outdoor gatherings, the DNV series offers dependable performance tailored to user requirements.
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