Dayton Chart 4.1 - Troubleshooting Guide, Models 1RVT7 and 1RVT8, Symptom, Possible Cause

Dayton Installation, Operation, Maintenance and Parts Manual

Models 1RVT7 and 1RVT8

Chart 4.1 - Troubleshooting Guide

Symptom

Possible Cause

Corrective Action

Burning of gas-air mixture inside	• Heater mounted at incorrect angle.	• Mounting angle 0˚- 30˚.
plenum (flashback).	• Excessive drafts.	• Relocate or shield from draft.
	• Gas leaking at orifice.	• Check with leak detector solution.
	• Separation of ceramic grids.	• Replace burner.
	• Ceramic grids cracked.	• Replace burner.
Delayed ignition.	• Electrode out of specification.	• See ignition system insert.
	• Low gas pressure.	• See Section 2.0, Gas Supply.
	• Partially blocked orifice.	• Clean or replace.
	• Improper orifice size.	• Consult Dealer.
	• Incorrect gas.	• See unit nameplate.
Low ceramic surface	• Dirty or plugged burner ceramics.	• See periodic maintenance instructions.
temperature or excessive	• Partially blocked orifice.	• Remove and clean.
rollout.	• Low inlet gas pressure.	• See Section 2.0, Gas Supply.
	• High or low manifold gas pressure.	• Adjust main valve regulator as specified.
	• Foreign matter in venturi tube.	• See periodic maintenance instructions.
	• Excessive dark spots on burner.	• See periodic maintenance instructions.
	• Gas supply piping too small.	• Increase inlet pressure or replace piping.
	• Incorrect gas.	• See unit nameplate.
Control system overheating.	• Heater not mounted correctly.	• Mounting angle 0˚- 30˚. Level left to right.
	• Heater mounted too close to ceiling.	• Observe clearance to combustibles.
Gas odor.	• Loose pipe connection.	• Check connections. Tighten as necessary.
Heater cycles repeatedly.	• Heater located in drafty area.	• Relocate or shield from draft.
	• Low gas pressure.	• See Section 2.0, Gas Supply.
	• Thermostat located in drafty area.	• Relocate thermostat.
	• Defective electrode or circuit board.	• Replace.
No spark; no ignition.	• Lack of 120V incoming voltage.	• Check power supply.
	• Open high voltage wire.	• Isolate an ohm for resistance, replace if 0.
	• Fan not operating.	• Locate source of electrical problem or
		replace faulty fan.
	• Improper electrode gap.	• See Ignition System specifications.
	• Loose or open wire connection.	• Check all wires, tighten or replace.
	• Pressure switch not satisfied.	• Verify fan operation. Remove obstructions.
	• Poor or no equipment ground.	• Check all connections, provide positive
		earth ground.
	• Unit in “safety lockout” mode.	• Interrupt power source, repeat trial for ignition.
	• Defective “gaslighter” control.	• Replace.
Heater lights, and “locks out”	• Poor or no equipment ground.	• Check all connections, provide positive
after approximately 10 seconds.		earth ground.
	• Polarity is reversed.	• 120V to black, neutral to white.
	• Low gas pressure.	• See Section 2.0, Gas Supply.
	• Electrode not sensing.	• Relocate or replace if defective.
	• Heater mounted at incorrect angle.	• Mounting angle 0˚- 30˚.
	• Defective “gaslighter” control.	• Replace.
Spark is present. No main gas	• Gas valve in “OFF” position.	• Turn to “ON” position.
operation. Unit “locks out”.	• Defective gas valve.	• Isolate and check for resistance, replace if 0.
	• Defective “gaslighter” control.	• Replace.
Heater will not shut off.	•Defective thermostat or wiring.	• Replace or repair.
	• Gas valve stuck or open.	• Replace.
	• High gas pressure.	• See Section 2.0, Gas Supply.

®

21