Have lost the control turn knobs for the ignition and heat settings

To turn on the oven on your Defy Thermo Fan gas stove, follow these steps:

1. Make sure that the oven is properly connected to a gas supply and that the gas valve is turned on.
2. Turn the oven control knob to the desired temperature setting.
3. Press the oven ignition button to ignite the gas. You may need to hold the button down for a few seconds until the gas ignites.
4. If the gas does not ignite, check the ignition system and make sure that it is functioning properly. You may need to consult the stove's manual or contact a professional for further assistance.
5. Once the oven is ignited, it should begin heating up to the desired temperature.

Keep in mind that it may take a few minutes for the oven to reach the desired temperature, depending on the setting you have chosen. You can use the oven control knob to adjust the temperature as needed.
If you are having trouble turning on the oven on your Defy Thermo Fan gas stove or if you have any other questions, you may want to consult the stove's manual or contact Defy customer support for further assistance.

Could be the instructions are out of date as sometimes the button on other appliances has been integrated into the main control knob. Perhaps this is the case with your appliance...

If this is the case the lighting instruction might be similar to below.
In the off position it is possible to push the control knob in a short way to supply gas to the pilot and then turn the knob anti-clockwise for ignition. Once lit it is important to keep the knob pushed in until the thermocouple is warm enough to maintain gas flow and then it can be released and the desired heat setting selected.

First locate where to light pilot. You can do this by following thin aluminum colored tubing from control valve to inside heater.In general on top of your gas control valve is a knob. Turn indicator of this knob to pilot and depress knob. This will start gas flow to pilot at end of thin tube. Hold this knob in the depressed position and light pilot. DO NOT release knob for 30 -45 seconds. Then release knob and pilot will remain lit. Then turn knob to on position. If pilot will not stay lit you may need a new thermo coupler, which senses heat from flame to keep pilot gas flow open.
Good luck

Seems to me you have a defective control panel board.. Ovens should never do this. Time for the Serviceman right away, this could be dangerous if you are not home.

, push in and turn the control knob to the full on position (large flame symbol). If your hob has an ignition switch on the facia, press it in until your burner lights. • Hold the control knob in for 15 seconds then release. If the burner fails to light within this time, release the control knob and wait one minute before attempting to re-ignite.
or
Push in the control knob and after a couple of seconds press the ignition switch. • Hold the control knob in for 15 seconds then turn to desired heat, If the burner fails to light within this time, release the control knob and wait one minute before attempting to re-ignite.

Part of the problem may be, that when you turn the control knob to ignition, you're not holding it in long enough for Thermocouple or Thermopile to thoroughly heat up after the pilot lights. You should hold the bottom down for 30 seconds to a minute, to allow it to heat up. Then, when you slowly release it. If the pilot remains lit, turn the knob to the desire position.

If the above doesn't solve the problem, the Thermocouple or Thermopile (aka Pilot Generator) will need to be replaced.

Hope this helped you. Cheers

Has the Gas Control Knob been turned from the Pilot position to the ON position? If not, it won't light the burners.

1. Check electricity is on.
2. Check oil is in the tank and valve turned on.
3. Switch the fan off at the bottom left hand corner.
4. Switch oil knob to No.1.
5. Set Air knob to No.3.
6. Operate re set button (right hand corner of heater under settings dial). Either press in until it clicks or if the pull out version pull out until it clicks.

Wait - ignition should take place in a few minutes and flames will appear on the left of the burner under the radiants.

You should get occasional yellow crests above the pure blue flame just visible below the top row of burner holes under the radiants.

After the red warning light goes out you can adjust to higher settings.

The radiants do not glow on low setting.

You can adjust the heater on to higher settings but this should be done gradually - no more than 2 settings at a time.

Some warnings:

* The unit must be correctly earthed.
* Do not use anything except heater oil.
* Never attempt to re-light the heater when it is hot.
* If the red light does not appear when the oil knob is switched on, immediately turn the oil knob off. Reasons include: Heater is too hot; Electric plug turned off; failure of ignition system.

Good luck - no responsibility taken for the advice (but it is largely copied from my Vulcan heaters instruction manual which I still have (installed in 1967).

sounds like the thermocouple (that sensors the heat) may be faulty.
you will need a licensed gas fitter for repairs

A link to an Adobe (Acrobat) Reader format (.pdf) owner's manual for Honeywell® (Mini Tower) SURROUND HEAT™ HEATER FAN Models HZ-2200 (charcoal) and HZ-2204 (white) is here.

Some text from the manual:

SET UP
• The Surround Heat™ Heater is designed to
disperse heat in either a 360° range or in one direction only.
• To select the desired heating mode, slide the Direction Control switch, located
on the top of the heater, to the position of your choice:
– to the right (full circle) for 360° Heating
– to the left (half circle) for forward only heating (One Direction
Heating)

OPERATING INSTRUCTIONS
Select the appropriate heat dispersion mode. (See
Set-Up instructions.)
• With the Power knob in the OFF position, plug the
heater into a polarized 120V outlet.
• Turn the Thermostat control fully clockwise to the
HIGH setting.
• Turn the heater on using the Child Resistant switch
(Power knob). To operate the switch, push down
the two sides of the Power knob while turning it
clockwise to the desired position. The power
light will illuminate. The Child Resistant switch helps
ensure that the heater can not be turned on accidentally.
• When the room reaches a comfortable temperature, slowly turn the Thermostat
control counter-clockwise until the heater goes off. This is the point at which the
Thermostat setting equals the room temperature. At this setting, the Thermostat
will automatically turn the heater on and off to maintain this selected temperature.
• Push down and turn the Power knob to OFF and unplug the heater when you
are finished using it.